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B.while C.before D.a(chǎn)fter【答案】C【解析】【詳解】句意:為了讓你的DIY作品完美,你最好在你把所有的工具都準(zhǔn)備好前不要開始。When當(dāng)……的時(shí)候;while當(dāng)……的時(shí)候;before 在……之前; after在……之后。所以選C。25.There are fewer and fewer tigers in India. The situation will continue _______ humans stop hunting them for their fur and bones.A.if B.unless C.because D.since【答案】B【解析】試題分析:句意:印度有越來越少的老虎。如果人類不停止為了虎皮和虎骨獵殺老虎,情況會(huì)繼續(xù)。,表示條件;,表示相反的條件;,表示原因;,表示時(shí)間的起點(diǎn);既然,表示原因?!叭绻弧蓖V?,情況會(huì)繼續(xù)。故選B??键c(diǎn):考查連詞的用法26.They didn39。t go to bed_____ the work was finished.A.when B.while C.until D.a(chǎn)fter【答案】C【解析】【詳解】句意:他們直到工作完成才睡覺??疾檫B詞。when當(dāng)……時(shí)候,可表示時(shí)間段或時(shí)間點(diǎn),一般主句使用過去進(jìn)行時(shí),從句使用一般過去時(shí);while當(dāng)……時(shí)候,而;until直到;after在……以后。短語“not… until…”:直到……才……;結(jié)合句意可知選C。27.(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(diǎn):考查連詞辨析。28.They will lose the game _______ they try their best.A.unless B.once C.since D.a(chǎn)fter【答案】A【解析】【詳解】試題分析:句意:他們會(huì)輸?shù)舯荣惖?,除非他們盡自己最大的努力。lose the game 輸?shù)舯荣?,try one’s best 盡最大的努力。 A. unless 除非; B. once 一次;C. since 因?yàn)椋?D. after 在…之后,根據(jù)題意可知此句是unless引導(dǎo)的條件狀語從句,故選A。29.—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(dòng)了。though盡管,引導(dǎo)讓步狀語從句;before在……之前,不符合對(duì)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。30.—____ the workers are very tired, _____they keep on working. — They are great. We must learn from them.A.Because。 / B.Though。 / C.Because。 so D.Though。 but【答案】B【解析】試題分析:句意:盡管工人們很累了,但他們?nèi)匀焕^續(xù)工作?!麄兲珎ゴ罅耍覀儜?yīng)該向他們學(xué)習(xí)。本題考查連詞的用法。Because用于表示因果關(guān)系,不能與so同時(shí)使用;Though用于表示轉(zhuǎn)折關(guān)系,不能與but同時(shí)使用。結(jié)合句意,故選B.考點(diǎn):考查連詞的用法。