Mary was caught in a traffic jam and by the time she arrived at the airport her father’s plane_______.
A．took off?
B．had already taken off?
C．was take off?
D．had already been taken off?
B?
by the time與she arrived這一過去的動作連用，表示到過去那時為止已經(jīng)完成的動作，用過去完成時。take off指“起飛”，沒有被動語態(tài)。??
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