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--Haven't you seen Mr. Wilson at the le...

 --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

 

B 【解析】 试题分析: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 考点:考查引导词的用法
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