题目内容
【题目】 By the time I got to the bus stop, the bus .
A. leave B. left
C. has left D. had left
【答案】D
【解析】
试题分析：句意：当我到达公共汽车站时，公共汽车已经离开了。过去完成时发生在过去的过去，结构是：had done.公共汽车是在I 到达之前离开的，所以用过去完成时，故选D.
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