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用“not…until”結(jié)構,意為“到……時候才” 根據(jù)句子結(jié)構,結(jié)合選項,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引導的條件狀語從句主句用一般將來時,從句用一般現(xiàn)在時,結(jié)合語境故選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?!堑?。對他來說很難實現(xiàn)這個夢想,但他從不放棄??疾檫B詞辨析題。A. after在……以后;B. since自從……;C. when當……時候;D. until直到……才,多和not連用。本句是時間狀語從句,四個選項都可做引導詞;根據(jù)Leonardo didn39。t win an Oscar和答語中的but he never gave up.,結(jié)合句意結(jié)構和語境,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單的旅行方式,但也會引起一些問題。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 因為; D. after 在…之后,根據(jù)題意可知此句是unless引導的條件狀語從句,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:如果你們不努力學習,你們就通不過考試。If如果,引導條件狀語從句;unless除非,引導條件狀語從句;since自從,因為,引導時間狀語從句;when當……時候,引導時間狀語從句;條件狀語從句用一般現(xiàn)在時表示一般將來時,主句用一般將來時,根據(jù)題中的時態(tài)和句意,如果不努力,就通不過考試,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:除非每個人都有保護環(huán)境的意識,否則環(huán)境會更糟??疾檫B詞辨析。unless除非,表條件,相當于if not;if如果,表條件;so that以便于,表目的。本句是條件狀語從句,根據(jù)句意語境,可知if不合句意,故選A。18.Daming hasn39。t done much exer