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题目
题型:不详难度:来源:
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

答案
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。
核心考点
试题【Mary was caught in a traffic jam and by the time she arrived at the airport her 】;主要考察你对一般现在时等知识点的理解。[详细]
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