题目内容

【题目】We were having a lesson       a policeman came in.

A. when B. while

C. until D. before

【答案】A

【解析】考查固定句式。句意:我们正在上课,突然一个警察进来了。此处when用作并列连词,表示"就在那时",相当于and at that time。故选A。

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