【題目】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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