【題目】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：我們正在上課，突然一個警察進來了。此處when用作并列連詞，表示＂就在那時＂，相當于and at that time。故選A。

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