【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(jī)場(chǎng)的時(shí)候,飛機(jī)已經(jīng)起飛了。have taken off已經(jīng)起飛了,是現(xiàn)在完成時(shí)態(tài);had taken off過(guò)去完成時(shí)態(tài);is taken off被起飛了,是一般現(xiàn)在時(shí)的被動(dòng)語(yǔ)態(tài);is taking off將要起飛,現(xiàn)在進(jìn)行時(shí)表示將來(lái)。句中by the time引導(dǎo)的是狀語(yǔ)從句,從句用一般過(guò)去時(shí)態(tài),主句用過(guò)去完成時(shí)態(tài),故選B。

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