When Bob and his friends came, we_____ our supper then.

A．had

B．were having

C．have

D．are having

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参考答案

【译文】当鲍伯和他朋友来的时候，我们正在吃晚饭。
【解析】本题考查when引导的时间状语从句。根据句意，从句的动作发生在主句动作进行的过程中，因此从句用一般过去时，主句应用过去进行时。故选B。

1 Since it is already midnight, we,_____ now.

A．had better leaving

B．had better leave

C．had better to leave

D．had better have left

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2 A completely new situation will _____ when the exam system comes into existence.

A．arise

B．rise

C．raise

D．arouse

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3 They didn' t _____ the wedding because of a heavy rain.

A．join

B．take part

C．attend

D．appear

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