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

问题补充：

）When the teacher came in, the students at once.

A. stopped to talk

B. stopped talking

C. stoped talking

D. stoped to talk

答案：

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。