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er was explaining the experiment to the students.A.until B.before C.while D.a(chǎn)fter【答案】C【解析】句意“老師正向?qū)W生們解釋這個(gè)實(shí)驗(yàn),下課鈴聲響了?!眜ntil直到;before在……之前;while表示當(dāng)……時(shí)候,after在……之后。此處表示當(dāng)老師正講解實(shí)驗(yàn)時(shí),鈴聲響了,故用連詞while,故選C。13.— What were you doing ______ I knocked at the door?— I was sleeping.A.unless B.onceC.when D.while【答案】C【解析】【詳解】試題分析:句意:-我敲門時(shí),你在做什么?-我在睡覺。A.unless如果不,除非;引導(dǎo)條件狀語從句;B.once一旦……,引導(dǎo)條件狀語從句;C.when當(dāng)……時(shí),表示兩個(gè)動(dòng)作同時(shí)發(fā)生,主句一般使用過去時(shí),從句使用過去進(jìn)行時(shí);D.while當(dāng)……時(shí),表示兩個(gè)動(dòng)作同時(shí)發(fā)生,后跟延續(xù)性動(dòng)詞,從句一般使用進(jìn)行時(shí)態(tài),表示一段時(shí)間。本題表示“當(dāng)……時(shí)”,knock是非延續(xù)性動(dòng)詞,故選C。考點(diǎn):考查連詞辨析。14.I have to leave now __ I can catch the last bus.A.so that B.because of C.until D.a(chǎn)s soon as【答案】A【解析】試題分析:so that以便,所以;because of因?yàn)?,由于;until直到;as soon as一……就……。句意:為了趕上末班車,我現(xiàn)在必須離開了。結(jié)合語境可知選A。考點(diǎn):連詞辨析點(diǎn)評(píng):連詞在句子中主要起聯(lián)系上下文的作用,他們之間的區(qū)別就是表示邏輯關(guān)系的不同,所以在解題時(shí)先要理解上下文含義,然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞。連詞的用法都比較多,語義之間還有交叉,熟記其基本應(yīng)用規(guī)則,了解其區(qū)別,注意固定搭配對(duì)象,是做好此類題型的關(guān)鍵。15.Mrs. White walks a dog in the park nearby every morning it’s rainy or windy.A.since B.because C.unless D.until【答案】C【解析】試題分析:句意:如果不刮風(fēng)下雨,懷特夫人就會(huì)帶狗到附近的公園散步。A.. since自從;B.. because因?yàn)?;C.. unless如果不;D. .until直到……才。結(jié)合句意,故選C考點(diǎn):考查連詞的用法。16.——Today’s young people can’t live without smart phones.——They keep their hands on the phones wherever they go, even while they meals.A.have B.a(chǎn)re havingC.were having D.will have【答案】B【解析】【詳解】句意:——今天的年輕人沒有智能手機(jī)無法生活?!麄儫o論走到哪里,甚至吃飯時(shí),手里都拿著手機(jī)??疾榫渥訒r(shí)態(tài)。;;;。while后跟進(jìn)行時(shí)態(tài),主句時(shí)態(tài)是一般現(xiàn)在時(shí),可知while后面的從句時(shí)態(tài)用現(xiàn)在進(jìn)行時(shí)。故選B。17.I didn’t believe I could do it ____ I got to the top of Mount Tai.A.unless B.until C.a(chǎn)fter D.a(chǎn)s【答案】B【解析】試題分析:句意:直到我到達(dá)泰山頂上我才相信我能成功。A. unless如果不,除非,引導(dǎo)條件狀語從句; B. until 直到,引導(dǎo)時(shí)間狀語從句; C. after 在……后,引導(dǎo)時(shí)間狀語從句; D. as因?yàn)?,由于,引?dǎo)原因狀語從句。not …until直到……才,結(jié)合句意,故選B??键c(diǎn):考查連詞的用法。18.If you study hard, you ________