题目内容

When they saw their teacher into the classroom, they stopped at once.

A. walk; to talk B. walking; to talk

C. to walk; talking D. walking; talking

D 【解析】试题句意:当他们看到老师进入教室,他们离开停止了交谈。see sb doing sth看到某人正在做某事;see sb do sth,看到某人做了某事。stop doing sth,停止正在做的事情,stop to do sth,停下来去做某事。根据句意可知学生看到了老师进来,停止了正在做的动作,结合结构,故选D。
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