Haven't you seen Mr. Wilson at the lecture? --Yes, but he had left I could ask him any

发布时间：2020-08-17 00:24:43

--Haven't you seen Mr. Wilson at the lecture?
--Yes, but he had left      I could ask him any questions.
A. when
B. before
C. after
D. as

网友回答

A. when
(答案→)B. before
C. after
D. as
解析：考查引导词的用法，when 意思“当……时候”，所引导的从句，谓语动词可以是持续的，也可以是短暂性动词，谓语动词发生的时间可以与主句谓语动词的动作是同时的，before意思“在……之前”， after意思“在……之后”，as意思“当……时候”，侧重指从句与主句的动作同时进行，谓语动词可以是持续的，也可以是短暂性动词，句子意思“我将要问问题他就离开了”，所以选B
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