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
网友回答
A. keep; talking
(答案→)B. to keep; talking
C. keep; to talk
D. to keep; to talk
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。