题目内容

The children ________ at the table when their mother cooked in the kitchen．
A．wait            B．are waiting         C．were waiting
C
此题重点考查过去进行时的基本构成和用法。根据后面的时间状语从句的时态，可以判断出表示过去某一时间正在进行的动作，故用过去进行时，故选C
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