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        1. By the time they reached the bus stop, the bus__________ for ten minutes.
          A.had leftB.have leftC.had been awayD.have been away
          C

          試題分析:句意:到他們到達(dá)公交車站的時(shí)候,公交車已經(jīng)離開十分鐘了。句中by the time 的意思是到...時(shí)候,后跟從句,從句使用的是一般過去時(shí)。根據(jù)句意可知,從句中表示的動(dòng)作應(yīng)該發(fā)生在他們到達(dá)車站之前,故應(yīng)該用過去完成時(shí)。A是過去完成時(shí),但是left是瞬間性動(dòng)詞,不能和一段時(shí)間狀語連用;B是現(xiàn)在完成時(shí);C是過去完成時(shí),并且是系表結(jié)構(gòu),可以和一段時(shí)間連用;D是現(xiàn)在完成時(shí)。故選C。
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