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：等我到機場的時候，飛機已經(jīng)起飛了。have taken off已經(jīng)起飛了，是現(xiàn)在完成時態(tài)；had taken off過去完成時態(tài)；is taken off被起飛了，是一般現(xiàn)在時的被動語態(tài)；is taking off將要起飛，現(xiàn)在進行時表示將來。句中by the time引導的是狀語從句，從句用一般過去時態(tài)，主句用過去完成時態(tài)，故選B。
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