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till on duty.A.Although B.Once C.If【答案】A【解析】【詳解】句意“盡管今天是公共節(jié)假日,但是我們城市的一些消防員仍然在崗位值班”。(引導(dǎo)讓步狀語(yǔ)從句);……就……(引導(dǎo)時(shí)間狀語(yǔ)從句);(引導(dǎo)條件狀語(yǔ)從句)。根據(jù)句意可知,今天是公共假日,本應(yīng)該休息,但是消防員仍然在崗值班,表示讓步,故選A。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(chē)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.She didn39。t leave the school __________ she worked out this problem.A.a(chǎn)s long as B.until C.since D.while【答案】B【解析】【詳解】句意“直到她解決了這個(gè)問(wèn)題他才離開(kāi)學(xué)?!?。(引導(dǎo)條件狀語(yǔ)從句);(引導(dǎo)時(shí)間狀語(yǔ)從句);(引導(dǎo)時(shí)間狀語(yǔ)從句);……時(shí)候(引導(dǎo)時(shí)間狀語(yǔ)從句)。根據(jù)句意可知,譯為“直到他解決這個(gè)問(wèn)題他才離開(kāi)學(xué)校”。not...until...直到……才,故選B。16.You will never achieve success _____you devote yourself to your work.A.a(chǎn)fter B.if C.because D.unless【答案】D【解析】句意:除非你把自己專心于你的工作,否則你將永遠(yuǎn)不會(huì)成功。after在……之后;if如果;because因?yàn)?;unless除非;根據(jù)句意可知是unless引導(dǎo)的的條件狀語(yǔ)從句;故選D。17. Excuse me. Is it my turn now? Not yet. Please wait outside ________ your name is called.A.untilB.sinceC.so【答案】A【解析】句意: 打擾一下。 輪到我了嗎? 還沒(méi)。請(qǐng)?jiān)谕饷娴戎钡侥愕拿直唤械?。until用于肯定句中,意為“到…為止”,表示動(dòng)作一直持續(xù)到所說(shuō)時(shí)間為止,本句就是說(shuō)“到名字被叫到為之,請(qǐng)一直等待”,前半句和后半句中不存在因果關(guān)系,排除C,也沒(méi)有表示“自從”的意味,排除B,故選A。18. Talk to your teacher and you will get help ________ you have a problem.A.unless B.ifC.until D.so【答案】B【解析】試題分析:unless除非,如果不; if是否,如果;until直到;So因此。句意:如果你有問(wèn)題,給你的老師說(shuō)說(shuō),你就會(huì)得到幫助。故選B??键c(diǎn):考查連詞辨析19.I will call you as soon as he______ here.A.a(chǎn)rrive B.will arrive C.a(chǎn)rrives D.a(chǎn)rrived【答案】C【解析】【詳解】句意:他一到這里我就給你打電話。as soon as引導(dǎo)的時(shí)間狀語(yǔ)從句,遵循“主將從現(xiàn)”的原則,也就是當(dāng)主句是一般將來(lái)時(shí)態(tài)時(shí),從句用一般現(xiàn)在時(shí)態(tài),從句中的主語(yǔ)he是第三人稱單數(shù),動(dòng)詞要用三單形式,故答案為C?!军c(diǎn)睛】“主將從現(xiàn)”說(shuō)的是在含有時(shí)間狀語(yǔ)從句和條件狀語(yǔ)從句的主從復(fù)合句中,如果主句的時(shí)態(tài)是一般將來(lái)時(shí),那么從句要用一般現(xiàn)在時(shí)。時(shí)間狀語(yǔ)從句主要由as soon as, when, until等來(lái)引導(dǎo),條件狀語(yǔ)從句主要由if, unless來(lái)引導(dǎo)。如:I will tell him about it when he es. 他來(lái)的時(shí)候,我會(huì)告訴他這件事的。If it is fine tomorrow, we will go outing. 如果明天天氣好,我們就去郊游。20.— Harry P