题目内容
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?
解析:
by the time与she arrived这一过去的动作连用，表示到过去那时为止已经完成的动作，用过去完成时。take off指“起飞”，没有被动语态。??
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