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用“not…until”結(jié)構(gòu),意為“到……時(shí)候才” 根據(jù)句子結(jié)構(gòu),結(jié)合選項(xiàng),故選A。12.If the kids stay indoors all the time and get no exercise, they _________ weak.A.bee B.have bee C.will bee D.became【答案】C【解析】【詳解】句意:如果孩子們一直呆在室內(nèi)并且得不到鍛煉,他們將變得很虛弱。If引導(dǎo)的條件狀語(yǔ)從句主句用一般將來(lái)時(shí),從句用一般現(xiàn)在時(shí),結(jié)合語(yǔ)境故選C。13.—Leonardo didn39。t win an Oscar he acted in The Revenant(荒野求生).一Yeah. It was hard for him to realize this dream, but he never gave up.A.a(chǎn)fter B.since C.when D.until【答案】D【解析】句意:——列奧納多直到他在《荒野求生》中才獲得奧斯卡獎(jiǎng)?!堑摹?duì)他來(lái)說(shuō)很難實(shí)現(xiàn)這個(gè)夢(mèng)想,但他從不放棄。考查連詞辨析題。A. after在……以后;B. since自從……;C. when當(dāng)……時(shí)候;D. until直到……才,多和not連用。本句是時(shí)間狀語(yǔ)從句,四個(gè)選項(xiàng)都可做引導(dǎo)詞;根據(jù)Leonardo didn39。t win an Oscar和答語(yǔ)中的but he never gave up.,結(jié)合句意結(jié)構(gòu)和語(yǔ)境,可知until符合句意,故選D。14._______riding shared bikes is an easy way to travel, it also causes some problems.A.Although B.If C.Until【答案】A【解析】【詳解】句意:雖然騎共享單車是一種簡(jiǎn)單的旅行方式,但也會(huì)引起一些問(wèn)題。A. Although盡管,雖然;B. If如果;C. Until直到。根據(jù)下文it also causes some 。根據(jù)題意,故選A。15.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)舯荣惖模撬麄儽M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(yǔ)從句,故選A。16.Our head teacher often says, "You will not pass the exam ___________ you work hard."A.if B.unless C.since D.when【答案】B【解析】句意:我們的班主任常說(shuō):如果你們不努力學(xué)習(xí),你們就通不過(guò)考試。If如果,引導(dǎo)條件狀語(yǔ)從句;unless除非,引導(dǎo)條件狀語(yǔ)從句;since自從,因?yàn)椋龑?dǎo)時(shí)間狀語(yǔ)從句;when當(dāng)……時(shí)候,引導(dǎo)時(shí)間狀語(yǔ)從句;條件狀語(yǔ)從句用一般現(xiàn)在時(shí)表示一般將來(lái)時(shí),主句用一般將來(lái)時(shí),根據(jù)題中的時(shí)態(tài)和句意,如果不努力,就通不過(guò)考試,故此處用unless。故選B。17.The environment will be much worse ___________ everyone has a sense of protecting it.A.unless B.if C.so that【答案】A【解析】【詳解】句意:除非每個(gè)人都有保護(hù)環(huán)境的意識(shí),否則環(huán)境會(huì)更糟。考查連詞辨析。unless除非,表?xiàng)l件,相當(dāng)于if not;if如果,表?xiàng)l件;so that以便于,表目的。本句是條件狀語(yǔ)從句,根據(jù)句意語(yǔ)境,可知if不合句意,故選A。18.Daming hasn39。t done much exer