）When the teacher came in, the students at once.A. stopped to talkB. stopped talkingC. sto

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A. stopped to talk
(答案→)B. stopped talking
C. stoped talking
D. stoped to talk
解析：stop后接不定式表示停下来去做某事，接动名词表示停止正在做的事情。句意：当老师进来时，学生们立即停止了说话。结合语境可知是停止正在进行的动作，选项C，stop变过去时态有误，故选B。