问题补充：
When the teacher came in, all of us .
A. stopped talking
B. stopped to talk
C. stop talking
D. stop to talk
答案：
(答案→)A. stopped talking
B. stopped to talk
C. stop talking
D. stop to talk
解析：句意是：当老师进来时我们都停止了说话。根据宾语从句时态一致原则，所以stop用过去式；stop to do是开始做正在做的之外的事的意思，stop doing 是停止正在做事情。根据句意是停止不说话了，故选A。
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