When Miss Green asked us ________ silent...

When Miss Green asked us ________ silent, we stopped ________ at once.

A．keep; talking

B．to keep; talking

C．keep; to talk

D．to keep; to talk

B 【解析】试题分析:根据语境可知此句的含义是当Green老师让我们大家安静的时候，我们立刻停止了谈话。在这个句子中涉及到几个句型结构。Ask sb to do sth表示让某人做某事，keep silent表示保持安静。Stop doing sth表示停止做某事。故选B。考点：动词的固定结构

考点分析：

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