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條件狀語從句用一般現(xiàn)在時,主句用一般將來時;because因為,since自從,引導(dǎo)時間狀語從句,主句用現(xiàn)在完成時;unless除非,如果不,引導(dǎo)條件狀語從句用一般現(xiàn)在時,主句用一般將來時;結(jié)合句意,如果她不確定有人照顧病人,她不會離開。故選D。20.Can students go online during lessons?They can’t ________ it is for that lesson.A.if B.unless C.until D.while【答案】B【解析】【詳解】句意:——學(xué)生上課時能上網(wǎng)嗎?他們不可以,除非為了上那堂課。本題考查連詞辨析,;;;……時候。答語是條件狀語從句,根據(jù)句意結(jié)構(gòu)可知,需要unless連接,故選B。21.My English teacher has taught English she came to the school.A.since B.a(chǎn)s C.when D.for【答案】A【解析】【詳解】考查連詞辨析,句意:我的英語老師自從來到這個學(xué)校就教英語.結(jié)合語境推斷句意是我的英語老師自從來到這個學(xué)校就教英語.,此句中的謂語動詞用了現(xiàn)在完成時,本題設(shè)空處后面的時間狀語從句用了一般過去時,所以結(jié)合句意用現(xiàn)在完成時的標(biāo)志詞since引導(dǎo),故選A22. — When did you go to bed last night?— ____________ I finished my homework.A.Until B.Not until C.When D.While【答案】B【解析】not …until 表示直到…才,與短暫性動詞連用,故選B23.I won39。t go he es back.A.until B.while C.when D.why【答案】A【解析】句意:直到他回來,我才走。A. until 直到; B. while當(dāng)時候; C. when當(dāng)時候; D. why為什么;notuntil 直到才;故選A24. Lucy knew nothing about it _____ her sister told her.A.because B.until C.if D.since【答案】B【解析】試題分析:句意:露西直到她姐姐告訴她才知道這件事。Because因為; until直到; if如果; since自從。Notuntil直到才,是一個固定句型。所以選B??键c:考查連詞。25. What was the party like? Wonderful. It’s years ____ I enjoyed myself so much.A.since B.a(chǎn)fter C.when D.before【答案】A【解析】試題分析:句意:聚會怎么樣?太精彩了,好多年了我沒玩的這么高興過。此題是考查句型:It’ s years + since + 一般過去式,此題中的動詞是enjoyed延續(xù)性動詞,應(yīng)從動作結(jié)束算起,可以翻譯成它的反義詞,故選A??键c:考查連詞的用法26.Today’s young people can’t live without smart phones. They keep their hands on the phones whenever they go, even while they_______meals.A.had B.will haveC.a(chǎn)re having D.were having【答案】C【解析】【詳解】句意:今天的年輕人沒有智能手機(jī)就活不下去。無論何時甚至在吃飯時他們都手里拿著手機(jī)??疾閯釉~時態(tài)。while表示一段時間,后面使用進(jìn)行時態(tài),主句是一般現(xiàn)在時,可知從句使用現(xiàn)在進(jìn)行時;故答案C。27.Cathy is afraid of the dog. She will run away _______she sees it.A.ever since B.a(chǎn)lthough C.a(chǎn)s soon as D.so that【答案】C【解析】【詳解】句意:凱西害怕狗,她一看到狗就跑了。考查連詞辨析。A. ever since自從;B. although雖然、盡管;C. as soon as一…就;D. so that以便;所以。根據(jù)Cathy is afraid of the dog. 凱西害怕狗,可推知是她一看到狗就跑開了,結(jié)合選項可知C選項符合題意,故答案選C。28.—Did you catch the early bus this morning? —Yes. The bus started to move _ I got on it.A.though B.before C.a(chǎn)s soon as D.a(chǎn)s if【答案】C【解析】句意:你今天早上趕上早班車了嗎?——是的。我一上車,車就開動了。though盡管,引導(dǎo)讓步狀語從句;before在……之前,不符合對話的意思;as soon as一……就;as if猶如,好像。結(jié)合下面的回答Yes,說明說話人趕上了早班車,所以選C。29.I’ll go to visit my aunt in England _______ the summer holiday starts.A.while B.since C.until D.a(chǎn)s soon as【答案】D【解析】【詳解】句意:暑假一開始,我就要去看望我在英國的姑姑??疾檫B詞辨析。A.while正當(dāng)……的時候;B.since因為;C.until 直到;D.a(chǎn)s soon as一……就……。此處是時間狀語從句, 據(jù)題意,故選D。30.(題文)— Did you win the game yesterday?— Not really. ______we all tried our best, we lost it.A.If B.Though C.Unless【答案】B【解析】試題分析:句意:你昨天贏了比賽了嗎?沒有,我們都盡了最大努力,但是還是輸了比賽。A.If如果; B.Though雖然,盡管; C.Unless除非。根據(jù)句意故選B??键c:考查連詞辨析。31.—When is the school art festival?—It will be held on time if it next Monday.A.don’t rain B.won’t rain C.doesn’t r