By the time I got to the airport.the plane .A. have taken off B. had taken offC. is taken off D. is taking off 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 ta 题目和参考答案——青夏教育精英家教网—

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

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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