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【题目】By the time I got to the airport,the plane ________ .

A. have taken off B. had taken off

C. is taken off D. is taking off

【答案】B

【解析】

句意:等我到机场的时候,飞机已经起飞了。have taken off已经起飞了,是现在完成时态;had taken off过去完成时态;is taken off被起飞了,是一般现在时的被动语态;is taking off将要起飞,现在进行时表示将来。句中by the time引导的是状语从句从句用一般过去时态主句用过去完成时态故选B。

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