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Unit 5 Art world
原因狀語(yǔ)從句
學(xué)校:___________姓名：___________班級(jí)：___________考號(hào)：___________
一、單項(xiàng)選擇
1．（24-25九年級(jí)上·江蘇南通·期末）The word “as” in the sentence “As he likes the sounds of nature, Tan uses them a lot in his music.” is used to ________.
A．show cause B．show purpose C．show result D．show time
2．（24-25九年級(jí)上·江蘇南通·期末）It’s important to keep learning about new ideas and technology ________ the world changes fast.
A．so B．or C．unless D．since
3．（24-25九年級(jí)上·江蘇徐州·期末）— It’s said that Xuzhou Barbecue is famous and delicious.
— ______ we are here, why not go and try it
A．Since B．If C．Until D．Whenever
4．（24-25九年級(jí)上·江蘇常州·階段練習(xí)）—_______ heavy the snow that is falling in Changzhou is! How can we go to work today
—_______ it is snowing heavily, let’s walk instead of driving.
A．What; Because B．What a; Since C．How; Since D．How; Though
5．（24-25九年級(jí)上·江蘇南京·階段練習(xí)）—Mother’s Day is coming. Shall we make a big dinner for Mum
—Good idea! But please give me some guidance (指導(dǎo)), ________ I don’t know how to cook.
A．though B．but C．a(chǎn)s D．while
6．（24-25九年級(jí)上·江蘇南通·期中）________ you can’t work out the problem by yourself, you’d better ask others for help.
A．Until B．Though C．Since D．Unless
7．（24-25九年級(jí)上·江蘇無(wú)錫·期中）—Could you help me with the housework _________ you are free today, Frank
—No problem, dear.
A．since B．though C．unless D．until
8．（24-25九年級(jí)上·江蘇泰州·期中）Some of the students are nearsighted (近視) ________ they spend too much time watching TV or playing online.
A．when B．though C．because D．if
9．（24-25九年級(jí)上·江蘇揚(yáng)州·階段練習(xí)）________ white represents purity and peace, it is used in many important situations.
A．While B．Whether C．Since D．Though
10．（23-24九年級(jí)上·江蘇揚(yáng)州·期中）_______ it rained heavily, Daddy suggested ________ the room quickly.
A．Since; entering B．As; to enter C．As; to enter into D．Since; entering into
11．（23-24九年級(jí)上·江蘇宿遷·期中）I want to buy something special for my mother, ________ her birthday is coming.
A．so B．a(chǎn)lthough C．because D．but
12．（23-24九年級(jí)上·江蘇揚(yáng)州·期末）—What shall we do to kill time
—Well, ________ it is Star Cinema’s half-price day, why not go to watch a film
A．since B．whether C．a(chǎn)lthough D．until
13．（23-24九年級(jí)上·江蘇揚(yáng)州·期末）________ we are good friends, let me share your trouble and worries.
A．Since B．Though C．Until D．Unless
14．（22-23九年級(jí)上·江蘇常州·期末）________ you didn’t answer my call, I left a message on WeChat.
A．If B．As C．While D．Before
15．（22-23九年級(jí)上·江蘇南通·階段練習(xí)）—It’s said that Beijing Duck is very famous and delicious.
—Well, _______ we’re here, why not go to the restaurant and order some
A．unless B．though C．whenever D．since
16．（23-24九年級(jí)上·上海浦東新·期中）We didn’t enjoy the holiday ________ the weather was so awful.
A．though B．if C．unless D．because
17．（22-23九年級(jí)上·江蘇鹽城·階段練習(xí)）________ everyone is here, let’s begin our meeting.
A．Unless B．Since C．Although D．When
18．（22-23九年級(jí)上·江蘇宿遷·期末）—It’s said that Xinyuan mutton tastes delicious.
—Well, ________ we are here, why not go to the restaurant and order some
A．though B．unless C．since D．whenever
19．（2023·江蘇淮安·一模）—Mother’s Day is coming. Shall we make some nice cards for our mothers
—Good idea! But would you please show me how to make them ________ I am not good at DIY
A．until B．when C．while D．since
20．（2023·江蘇南通·中考真題）________ you can’t work out the problem, perhaps you need to ask your classmates for help.
A．Unless B．Though C．Since D．Whether
21．（21-22九年級(jí)上·江蘇宿遷·期末）—What a heavy snow! How can we go to work today
—________ it is snowing heavily, let’s walk instead of driving.
A．Because B．Since C．As D．Though
22．（21-22九年級(jí)上·江蘇揚(yáng)州·期末）________ this computer doesn’t work, let’s try another.
A．Since B．Because C．After D．While
23．（21-22九年級(jí)上·江蘇淮安·期末）—Why do you like listening to music
—________ it makes me feel relaxed.
A．Because of B．Because C．Since D．As
24．（21-22九年級(jí)上·江蘇鎮(zhèn)江·期末）________ we’ve made the promise, let’s try to keep it.
A．Whether B．Since C．Though D．Unless
25．（21-22九年級(jí)上·江蘇鹽城·期末）—It’s said that Donglai fish soup noodles taste delicious.
—Well, ________ we are here, why not go to the restaurant and order some
A．though B．unless C．since D．whenever
26．（21-22九年級(jí)上·江蘇淮安·期中）_________ everybody is here now, let’s begin our meeting.
A．With B．For C．If D．Since
27．（22-23九年級(jí)上·江蘇南通·階段練習(xí)）—You recommend me to wear an orange shirt today, right
—Yes. ________ orange can bring you good luck, it is good for your interview.
A．As B．When C．If D．While
28．（22-23九年級(jí)上·江蘇無(wú)錫·階段練習(xí)）—Do you think I should wear an orange shirt today
—Yes. ________ orange can bring you good luck, it is good for your interview.
A．And B．As C．But D．While
29．（2022·江蘇無(wú)錫·二模）________ your father is well again, you no longer have anything to worry about.
A．Since B．Before C．Although D．While
30．（2022·江蘇常州·二模）________ you have finished most of your homework at school, you needn’t stay up late to do it.
A．Before B．Until C．Since D．When
31．（2022·江蘇南通·一模）_________ most people get news online, printed newspapers won’t disappear in a hurry.
A．Because B．Since C．Though D．Unless
32．（2021·江蘇蘇州·二模）________ people have to be at least 18 to get the vaccine(疫苗), I have to wait several weeks for my next birthday.
A．Since B．Before C．Until D．When
33．（21-22九年級(jí)上·江蘇蘇州·階段練習(xí)）—Christmas is coming. Shall we make a card for Miss Li
—Good idea! But please show me how to make it. I know little about DIY.
A．until B．when C．a(chǎn)s D．unless
34．（21-22八年級(jí)上·甘肅酒泉·期末）________ it was raining, we had to stay at home.
A．When B．Because of C．Because D．If
35．（21-22九年級(jí)上·江蘇宿遷·期中）—Let’s go to the science and technology museum now.
—OK. ________ it’s raining outside, we’d better take an umbrella and go there by taxi.
A．As B．When C．Until D．If
36．（2025·江蘇·二模）It’s important to keep learning about new technology ______ the world changes so fast.
A．so B．or C．since D．unless
37．（2024·江蘇宿遷·一模）______ he got up late, ______ he missed the early bus.
A．Because, so B．Because of, so C．Because, / D．Because of, /
38．（2022·江蘇淮安·中考真題）We would like to buy electric cars ________ they produce less air pollution.
A．because B．so C．though D．but
39．（2021·江蘇無(wú)錫·中考真題）________ we’ve made the promise, let’s keep to it and not give up easily.
A．Whether B．Since C．Though D．Unless
二、完成句子
40．（24-25九年級(jí)上·甘肅天水·期中）既然天氣很糟糕，為何不推遲運(yùn)動(dòng)會(huì)
the weather is bad, why not put off the sports meet
41．（23-24九年級(jí)上·全國(guó)·隨堂練習(xí)）既然孩子們都知道了，我們可以告訴其他人。
the children know, we can tell anyone else.
42．（22-23九年級(jí)上·陜西咸陽(yáng)·期中）既然你不想加入我們，你可以離開(kāi)了。
you don’t want to join us, you may leave.
43．（22-23九年級(jí)上·甘肅定西·階段練習(xí)）既然每個(gè)人都到了，我們開(kāi)始上課吧。
everyone is here, let’s start our lesson.
44．（22-23九年級(jí)上·全國(guó)·課后作業(yè)）因?yàn)樽T盾喜歡天籟之音，所以他多次將其運(yùn)用到他的音樂(lè)中。
he likes the sounds of nature, Tan Dun in his music.
45．（22-23九年級(jí)上·全國(guó)·單元測(cè)試）由于他身體欠佳，我決定獨(dú)自去那里。
he was not feeling well, I go there alone.
46．（22-23九年級(jí)上·全國(guó)·課后作業(yè)）我們不能去野餐，因?yàn)檎谙潞艽笥辍?br/>We can’t go for a picnic .
47．（22-23九年級(jí)上·全國(guó)·課后作業(yè)）凱特很傷心, 因?yàn)樗男∝埶懒恕?br/>Kate was sad .
48．（23-24九年級(jí)下·江蘇常州·期末）既然這個(gè)項(xiàng)目很有價(jià)值，為何不盡快開(kāi)展呢？
Why don’t you it is of great value
49．（2024·江蘇常州·一模）既然這個(gè)任務(wù)很有價(jià)值，為何不盡快開(kāi)展呢？
Why not
50．（2024九年級(jí)·全國(guó)·專(zhuān)題練習(xí)）既然都到了，讓我們開(kāi)始吧。
is here, let’s begin.
21世紀(jì)教育網(wǎng)(www.21cnjy.com)
《Unit 5 Art world 語(yǔ)法Grammar 原因狀語(yǔ)從句》參考答案
題號(hào) 1 2 3 4 5 6 7 8 9 10
答案 A D A C C C A C C A
題號(hào) 11 12 13 14 15 16 17 18 19 20
答案 C A A B D D B C D C
題號(hào) 21 22 23 24 25 26 27 28 29 30
答案 B A B B C D A B A C
題號(hào) 31 32 33 34 35 36 37 38 39
答案 C A C C A C C A B
1．A
“因?yàn)樗矚g大自然的聲音，所以譚先生經(jīng)常在他的音樂(lè)中使用它們。”句子中的as用來(lái)表原因。
考查原因狀語(yǔ)從句。show cause表原因；show purpose表目的；show result表結(jié)果；show time表時(shí)間。由“he likes the sounds of nature, Tan uses them a lot in his music.”可知，因?yàn)樗矚g大自然的聲音，才會(huì)經(jīng)常使用他們，As在此句中引導(dǎo)原因狀語(yǔ)從句，表示“因?yàn)椤薄９蔬xA。
2．D
不斷學(xué)習(xí)新的想法和技術(shù)很重要，因?yàn)槭澜缱兓芸臁?br/>考查連詞辨析。so因此；or或者；unless除非；since因?yàn)椤８鶕?jù)語(yǔ)境可知，“不斷學(xué)習(xí)新的想法和技術(shù)”和“世界變化很快”之間是因果關(guān)系，且后半句是前半句的原因，應(yīng)該用since引導(dǎo)原因狀語(yǔ)從句。故選D。
3．A
——據(jù)說(shuō)徐州燒烤遠(yuǎn)近聞名，味道鮮美。——既然我們?cè)谶@里，我們?yōu)槭裁床蝗ピ囋嚹兀?br/>考查原因狀語(yǔ)從句。Since既然；If如果；Until直到；Whenever無(wú)論何時(shí)。根據(jù)“...we are here, why not go and try it ”可知，此處說(shuō)明一個(gè)已知的理由，用since引導(dǎo)原因狀語(yǔ)從句。故選A。
4．C
——常州下的雪可真大啊！今天我們?cè)趺慈ド习啵俊热谎┫碌煤艽螅覀冏呗肪筒婚_(kāi)車(chē)了。
考查感嘆句和連詞。What引導(dǎo)感嘆句，后加名詞短語(yǔ)；How引導(dǎo)感嘆句，后加形容詞或副詞；because因?yàn)椋籹ince既然；though盡管。heavy是形容詞，故用how引導(dǎo)感嘆句；根據(jù)“it is snowing heavily, let’s walk instead of driving.”可知，既然下大雪，那就不開(kāi)車(chē)了，用since表示顯而易見(jiàn)的原因。故選C。
5．C
——母親節(jié)快到了。我們?yōu)閶寢屪鲆活D豐盛的晚餐好嗎？——好主意！但是請(qǐng)給我一些指導(dǎo)，因?yàn)槲也恢涝鯓优腼儭?br/>考查連詞辨析。though盡管；but但是；as因?yàn)椋粀hile當(dāng)……時(shí)。“I don’t know how to cook.”是“But please give me some guidance”的原因，用as引導(dǎo)原因狀語(yǔ)從句。故選C。
6．C
既然你不能獨(dú)自解決問(wèn)題，你最好尋求他人幫助。
考查連詞辨析。Until直到，引導(dǎo)時(shí)間狀語(yǔ)從句；Though盡管，引導(dǎo)讓步狀語(yǔ)從句；Since既然，引導(dǎo)原因狀語(yǔ)從句；Unless除非，引導(dǎo)條件狀語(yǔ)從句。根據(jù)“you can’t work out the problem by yourself”可知，這是建議尋求幫助的原因，應(yīng)用Since引導(dǎo)原因狀語(yǔ)從句。故選C。
7．A
——弗蘭克，既然你今天有空，你能幫我做家務(wù)嗎？——沒(méi)問(wèn)題，親愛(ài)的。
考查連詞。since因?yàn)椋籺hough盡管；unless除非；until直到。根據(jù)“Could you help me with the housework…you are free today, Frank ”可知，空后應(yīng)是從句作原因狀語(yǔ)；since“因?yàn)椤保龑?dǎo)原因狀語(yǔ)從句。故選A。
8．C
有些學(xué)生近視，因?yàn)樗麄兓ㄌ鄷r(shí)間看電視或玩網(wǎng)絡(luò)游戲。
考查連詞辨析。when當(dāng)……時(shí)候；though雖然；because因?yàn)椋籭f如果。“they spend too much time watching TV or playing online”是“Some of the students are nearsighted”的原因，所以用because引導(dǎo)原因狀語(yǔ)從句，故選C。
9．C
因?yàn)榘咨砑儩嵟c和平，所以它被用于許多重要場(chǎng)合。
考查連詞辨析。While當(dāng)……時(shí)；Whether是否；Since因?yàn)椋籘hough雖然。根據(jù)“white represents purity and peace, it is used in many important situations.”可知，句子前句是后句的原因，用since引導(dǎo)原因狀語(yǔ)從句。故選C。
10．A
因?yàn)橛晗碌煤艽螅职纸ㄗh趕快進(jìn)屋。
考查連詞辨析和非謂語(yǔ)動(dòng)詞。Since因?yàn)椋籩ntering進(jìn)入，為enter的動(dòng)名詞或現(xiàn)在分詞形式，主要用于具體的空間或物體的進(jìn)入，以及參與某些活動(dòng)或比賽；As當(dāng)……時(shí)；to enter為動(dòng)詞不定式；to enter into為動(dòng)詞不定式；entering into進(jìn)入，表示開(kāi)始從事某事、參與某活動(dòng)或討論細(xì)節(jié)。根據(jù)“…it rained heavily, Daddy suggested…the room quickly.”可知，此處指因?yàn)橛晗碌煤艽螅职纸ㄗh趕快進(jìn)屋；前半句與后半句為因果關(guān)系，第一個(gè)空應(yīng)用Since引導(dǎo)原因狀語(yǔ)從句；suggest doing sth.“建議做某事”，動(dòng)詞短語(yǔ)，第二個(gè)空表示“進(jìn)入房間”，應(yīng)用entering。故選A。
11．C
我想給我媽媽買(mǎi)一些特別的東西，因?yàn)樗纳湛斓搅恕?br/>考查連詞辨析。so因此；although雖然；because因?yàn)椋籦ut但是。根據(jù)“I want to buy something special for my mother”和“her birthday is coming”可知，前后是因果關(guān)系，前果后因，應(yīng)該用because引導(dǎo)原因狀語(yǔ)從句。故選C。
12．A
——我們?cè)撟鍪裁磥?lái)消磨時(shí)間呢？——好吧，既然今天是星空影院的半價(jià)日，為什么不去看電影呢？
考查從屬連詞辨析。since既然，因?yàn)椋ㄒ龑?dǎo)原因狀語(yǔ)從句）；whether是否；although盡管（引導(dǎo)讓步狀語(yǔ)從句）；until直到（引導(dǎo)時(shí)間狀語(yǔ)從句）。根據(jù)“…it is Star Cinema’s half-price day, why not go to watch a film”可知因?yàn)榻裉焓切强沼霸旱陌雰r(jià)日，所以建議一起去看電影。故選A。
13．A
因?yàn)槲覀兪呛门笥眩屛襾?lái)分擔(dān)你的麻煩和苦惱吧。
考查連詞辨析。Since因?yàn)椋籘hough雖然；Until直到；Unless除非。分析前后句關(guān)系可知，是因果關(guān)系，且前句是原因，因此用“Since”。故選A。
14．B
由于你沒(méi)有接我的電話(huà)，所以我在微信上留言了。
考查連詞辨析。If如果；As由于，因?yàn)椋籛hile當(dāng)……的時(shí)候；Before在……以前。根據(jù)“...you didn’t answer my call, I left a message on WeChat.”可知，因?yàn)閷?duì)方?jīng)]接電話(huà)，所以我才在微信上留言，前半句是后半句的原因，因此“As”符合語(yǔ)境。故選B。
15．D
——據(jù)說(shuō)北京烤鴨很有名，很好吃。——好吧，既然我們?cè)谶@里，為什么不去餐館點(diǎn)一些呢？
考查連詞辨析。unless除非；though盡管；whenever無(wú)論何時(shí)；since既然。根據(jù)“...we’re here, why not go to the restaurant and order some”可知，“我們?cè)谶@里”是“點(diǎn)餐”的原因，since引導(dǎo)原因狀語(yǔ)從句。故選D。
16．D
我們不喜歡這個(gè)假期，因?yàn)樘鞖馓愀饬恕?br/>考查連詞辨析。though雖然；if如果；unless除非；because因?yàn)椤Ｇ昂笫且蚬P(guān)系，前果后因，用because引導(dǎo)原因狀語(yǔ)從句。故選D。
17．B
既然大家都到齊了，我們開(kāi)始開(kāi)會(huì)吧。
考查連詞辨析。Unless除非；Since既然；Although盡管；When當(dāng)……時(shí)。根據(jù)“... everyone is here, let’s begin our meeting.”可知，既然所有人都在這里，那我們開(kāi)始會(huì)議，since符合語(yǔ)境，引導(dǎo)原因狀語(yǔ)從句。故選B。
18．C
——據(jù)說(shuō)鑫源羊肉味道鮮美。——嗯，既然我們都來(lái)了，為什么不去餐廳點(diǎn)一些呢？
考查連詞辨析。though盡管；unless除非；since既然；whenever無(wú)論何時(shí)。根據(jù)“...we are here, why not go to the restaurant and order some ”可知，既然我們?cè)谶@里，為什么不去飯店點(diǎn)一些吃呢，since符合語(yǔ)境，引導(dǎo)原因狀語(yǔ)從句。故選C。
19．D
——母親節(jié)就要到了。我們?yōu)槲覀兊膵寢屪鲆恍┢恋目ㄆ脝幔俊弥饕猓〉悄隳芨嬖V我怎么做嗎？因?yàn)槲也簧瞄L(zhǎng)DIY。
考查連詞辨析。until直到；when當(dāng)……時(shí)；while當(dāng)……時(shí)；since因?yàn)椤！癐 am not good at DIY”是“But would you please show me how to make them”的原因，用since引導(dǎo)原因狀語(yǔ)從句。故選D。
20．C
既然你解不出這道題，也許你需要向你的同學(xué)求助。
考查連詞辨析。Unless除非；Though盡管；Since既然，由于；Whether是否。“you can’t work out the problem”是向同學(xué)求助的原因，用Since引導(dǎo)原因狀語(yǔ)從句。故選C。
21．B
——多大的雪啊！我們今天怎么去上班？——既然雪下得很大，我們走路而不是開(kāi)車(chē)吧。
考查原因狀語(yǔ)從句。Because因?yàn)椋籗ince既然、因?yàn)椋籄s在……時(shí)；Though雖然。根據(jù)答句中“it is snowing heavily, let’s walk instead of driving”可知雪下得大是走路去上班的原因，用since引導(dǎo)原因狀語(yǔ)從句。故選B。
22．A
既然這臺(tái)電腦不能工作，讓我們?cè)嚵硪慌_(tái)吧。
考查從屬連詞辨析。Since因?yàn)椋热唬籅ecause因?yàn)椋籄fter在……之后；While在……期間。根據(jù)“this computer doesn’t work”可知，電腦不工作，是很明顯的原因，且置于主句之前，因此應(yīng)用since來(lái)引導(dǎo)原因狀語(yǔ)從句。故選A。
23．B
——你為什么喜歡聽(tīng)音樂(lè)？——因?yàn)樗屛腋械椒潘伞?br/>考查從屬連詞。Because of因?yàn)椋蟾陶Z(yǔ)；Because因?yàn)椋蟾渥樱籗ince既然；As由于。根據(jù)“Why do you like listening to music ”可知，Why提問(wèn)的特殊疑問(wèn)句詢(xún)問(wèn)原因，需要使用Because回答。故選B。
24．B
既然我們做了承諾，讓我們?cè)囍袷厮伞?br/>考查連詞辨析。Whether是否；Since既然；Though雖然；Unless除非。根據(jù)“we’ve made the promise, let’s try to keep it.”可知前后是因果關(guān)系，用since引導(dǎo)原因狀語(yǔ)從句。故選B。
25．C
——據(jù)說(shuō)東萊魚(yú)湯面味道鮮美。——既然我們來(lái)了，為什么不去餐廳點(diǎn)一些呢？
考查從屬連詞。though雖然；unless除非；since既然，自從；whenever無(wú)論何時(shí)。根據(jù)“Well, …we are here, why not go to the restaurant and order some ”可知，此處表原因，使用since引導(dǎo)原因狀語(yǔ)從句。故選C。
26．D
既然大家都到齊了，我們開(kāi)始開(kāi)會(huì)吧。
考查連詞辨析。with帶有；for因?yàn)椋籭f如果；since既然。根據(jù)“everybody is here now, let’s begin our meeting”可知，既然都到齊了，就可以開(kāi)始開(kāi)會(huì)，應(yīng)填since符合語(yǔ)境，故選D。
27．A
——你建議我今天穿一件橙色的襯衫，對(duì)嗎？——是的。因?yàn)槌壬芙o你帶來(lái)好運(yùn)，所以它對(duì)你的面試有好處。
考查連詞辨析。As因?yàn)椋籛hen當(dāng)……時(shí)；If如果；While然而。根據(jù)“orange can bring you good luck, it is good for your interview.”可知，前后兩個(gè)句子之間是因果關(guān)系，所以題空處應(yīng)填從屬連詞as。故選A。
28．B
——你認(rèn)為我今天應(yīng)該穿一件橙色的襯衫嗎？——是的。因?yàn)槌壬芙o你帶來(lái)好運(yùn)，它對(duì)你的面試很有好處。
考查連詞辨析。And和；As由于；But但是；While當(dāng)……時(shí)。根據(jù)“orange can bring you good luck, it is good for your interview”可知，前后句是因果關(guān)系，用as引導(dǎo)原因狀語(yǔ)從句，故選B。
29．A
既然你父親已經(jīng)康復(fù)了，你再也沒(méi)有什么可擔(dān)心的了。
考查連詞辨析。Since因?yàn)椋热唬籅efore在……之前；Although盡管；While當(dāng)……時(shí)。根據(jù)“you no longer have anything to worry about”可知，因?yàn)楦赣H已經(jīng)康復(fù)了，所以不需要擔(dān)心了；故選A。
30．C
既然你在學(xué)校已經(jīng)完成了大部分作業(yè)，所以你不必熬夜做。
考查連詞辨析。Before在……之前；Until直到；Since既然，因?yàn)椋籛hen當(dāng)。根據(jù)“you have finished most of your homework at school, you needn’t stay up late to do it”可知前后兩句是因果關(guān)系，前因后果，用since引導(dǎo)原因狀語(yǔ)從句。故選C。
31．C
雖然大多數(shù)人在網(wǎng)上獲得新聞，但紙質(zhì)報(bào)紙不會(huì)很快消失。
考查連詞辨析。because因?yàn)椋籹ince既然；though雖然；unless除非。“most people get news online”和“printed newspapers won’t disappear in a hurry”之間構(gòu)成讓步關(guān)系，用though引導(dǎo)讓步狀語(yǔ)從句。故選C。
32．A
由于人們必須年滿(mǎn)18歲才能接種疫苗，我得等幾個(gè)星期才能等到下一個(gè)生日。
考查連詞辨析。since既然，由于；before在……之前；until直到；when當(dāng)……時(shí)。“ people have to be at least 18 to get the vaccine”與“I have to wait several weeks for my next birthday”是因果關(guān)系，用since引導(dǎo)原因狀語(yǔ)從句，故選A。
33．C
——圣誕節(jié)快到了。我們給李小姐做一張卡片好嗎？——好主意！但是請(qǐng)告訴我怎么做，因?yàn)槲覍?duì)DIY知之甚少。
考查從屬連詞辨析。until直到；when當(dāng)……時(shí)；as因?yàn)椋籾nless除非。根據(jù)“But please show me how to make it. I know little about DIY”可知，空后解釋“告訴我怎么做”的原因，應(yīng)用as引導(dǎo)原因狀語(yǔ)從句。故選C。
34．C
因?yàn)橄掠辏覀儾坏貌淮粼诩依铩?br/>考查連詞辨析。When當(dāng)……時(shí)候；Because of因?yàn)椋竺娼用~（短語(yǔ)）、代詞、動(dòng)名詞等； Because因?yàn)椋B詞，后面接句子；If如果，連詞。通過(guò)句意可知，“正在下雨”是“我們不得不呆在家里的原因，“it was raining”是句子，所以用連詞because，引導(dǎo)原因狀語(yǔ)從句。故選C。
35．A
——我們現(xiàn)在去科技館吧。——好的。因?yàn)橥饷嬲谙掠辏覀冏詈脦О褌悖缓蟪顺鲎廛?chē)去那里。
考查連詞辨析。as由于；when當(dāng)……時(shí)；until直到；if如果。根據(jù)“it’s raining outside, we’d better take an umbrella and go there by taxi”可知，此處是解釋帶著傘，坐出租車(chē)去那里的原因，故選A。
36．C
因?yàn)槭澜缱兓绱酥欤猿掷m(xù)學(xué)習(xí)新技術(shù)很重要。
考查連詞辨析。so所以；or或者；since因?yàn)椋籾nless除非。根據(jù)“It’s important to keep learning about new technology...the world changes so fast.”可知，前后句是因果關(guān)系，前果后因，應(yīng)用since引導(dǎo)原因狀語(yǔ)從句。故選C。
37．C
因?yàn)槠鹜砹耍运e(cuò)過(guò)了早班公交車(chē)。
考查連詞辨析。because因?yàn)椋龑?dǎo)原因狀語(yǔ)從句，不能與so同用；because of因?yàn)椋蠼用~性短語(yǔ)。“he got up late”與“he missed the early bus”是因果關(guān)系，前因后果，第一空后接的是一個(gè)從句，故選C。
38．A
我們想買(mǎi)電動(dòng)汽車(chē)，因?yàn)樗鼈儺a(chǎn)生的空氣污染更少。
考查連詞辨析。because因?yàn)椋籹o因此；though盡管；but但是。上文“想買(mǎi)電動(dòng)汽車(chē)”和下文“電動(dòng)汽車(chē)產(chǎn)生較少空氣污染”之間是因果關(guān)系，前者是結(jié)果，后者表原因，故用because連接。故選A。
39．B
既然我們已經(jīng)許下了諾言，就讓我們信守諾言，不要輕易放棄。
考連詞。Whether是否；Since既然；Though雖然；Unless除非；根據(jù)“we’ve made the promise, let’s keep to it and not give up easily.”可知，此處表達(dá)的是因果關(guān)系，應(yīng)用since連接，引導(dǎo)原因狀語(yǔ)從句，故選B。
40． Now that
既然：now that，從屬連詞。故填Now；that。
41． Now that
now that“既然”，引導(dǎo)原因狀語(yǔ)從句，故填Now；that。
42．Now that/Since
now that和since均表示“既然”，引導(dǎo)原因狀語(yǔ)從句，位于句首，首字母n和s需大寫(xiě)。故填Now that/Since。
43． Now that
根據(jù)中英文對(duì)照可知，空處缺“既然”的英文翻譯。now that意為“既然”，置于句首，句首單詞首字母大寫(xiě)。故填Now；that。
44． As uses them a lot
as“因?yàn)椤保龑?dǎo)原因狀語(yǔ)從句；use“使用”；them“它們”，指代前文提到的sounds；a lot“經(jīng)常”，副詞修飾動(dòng)詞；此句是一般現(xiàn)在時(shí)，主語(yǔ)是第三人稱(chēng)單數(shù)，動(dòng)詞用三單。故填A(yù)s；uses them a lot。
45． As decided to
as“由于”，引導(dǎo)的原因狀語(yǔ)從句，常放在主句之前，說(shuō)明原因或理由，后面的主句說(shuō)明結(jié)果；decide to do sth. “決定做某事”，固定短語(yǔ)；根據(jù)漢語(yǔ)分析句子可知，這是一個(gè)由as引導(dǎo)的原因狀語(yǔ)從句，由“...he was not feeling well,”可判斷主句時(shí)態(tài)為一般過(guò)去時(shí)，謂語(yǔ)動(dòng)詞decide要使用過(guò)去式decided。故填A(yù)s；decided；to。
46．because it’s raining hard
根據(jù)句意可知，此句為現(xiàn)在進(jìn)行時(shí)，because：因?yàn)椋籭t’s raining hard：正在下很大雨，故填because it’s raining hard。
47．because her cat died/because of her cat’s death
分析所給中英文可知要翻譯的是“因?yàn)樗男∝埶懒恕薄！耙驗(yàn)椤睂?duì)應(yīng)的英文是“because”或“because of”；“死”對(duì)應(yīng)的英文是“die”；“because”后接從句；句子用一般過(guò)去時(shí)，故對(duì)應(yīng)的答案是because her cat died；“because of”后接短語(yǔ)；“die”對(duì)應(yīng)的名詞是“death”。故對(duì)應(yīng)的答案是because of her cat’s death。故填because her cat died/because of her cat’s death。
48．carry out the project as soon as possible since
carry out“開(kāi)展”，Why don’t you后跟動(dòng)詞原形；the project“這個(gè)項(xiàng)目”；as soon as possible“盡快”；since“既然”，引導(dǎo)原因狀語(yǔ)從句。故填carry out the project as soon as possible since。
49．carry out the task as soon as possible since it is valuable/carry out the task as soon as possible since it is of great value
開(kāi)展：carry out；這個(gè)任務(wù)：the task；盡快：as soon as possible；既然：since；it is作從句的主謂結(jié)構(gòu)；有價(jià)值：be valuable/be of great value。結(jié)合why not do sth，此處用動(dòng)詞原形。故填carry out the task as soon as possible since it is valuable/of great value。
50． Since everybody
since“既然”，引導(dǎo)原因狀語(yǔ)從句，everybody“每個(gè)人”，作主語(yǔ)，故填Since；everybody。
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