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— Did you see Tom at the party?— No, he __________ by the time I got there.A. had leftB. leftC. was leavingD. has left

— Did you see Tom at the party?— No, he __________ by the time I got there.

A. had left

B. left

C. was leaving

D. has left

题目解答

答案

A. had left

解析

本题考查过去完成时的用法。解题关键在于理解时间状语从句的结构和动作发生的先后顺序。当句中出现"by the time"引导的时间状语时，主句通常需要用过去完成时，表示主句的动作在从句动作（用一般过去时）之前完成。

选项分析

A. had left

过去完成时，表示"离开"的动作发生在"I got there"之前，符合逻辑顺序。

B. left

一般过去时，仅表示"离开"这个动作，但无法体现动作完成于"到达"之前。

C. was leaving

过去进行时，表示动作正在发生，与语境中"已经离开"的含义矛盾。

D. has left

现在完成时，表示与现在相关的动作，但句中明确提到的是过去的"got there"，时态不匹配。

关键结论

"by the time"引导的时间状语从句中，主句需用过去完成时，强调动作完成的先后关系。

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