Question

The children always talk and laugh, but when the teacher comes into the classroom they ...... 急！！

The children always talk and laugh, but when the teacher comes into the classroom they _____ their lesson. A. stop to do B. stop doing C. stops to do D. Stops doing

Answer 1

A

这里要区分 stop doing 和 stop to do 的差别
stop to do 表示停下郑子昂做的事去做别的。
stop doing 表示停下正在做的事

题目中说孩子们总是爱讲话爱笑，但是当老师进来的时候他们__ 他们的课，
这样的话肯定是说停下说话笑闹去听课，所以是选A， they是第三人称复数，排除C

楼主参考下~希望对你有帮助~

Answer 2

A

学习是一件愉快的事！ (*^__^*)
请及时采纳，多谢！

Answer 3

A. stop to do
stop to do 停下来去做另外一件事
stop doing停止正在做的事情

Answer 4

A.他们停下（说话）去做作业。
stop to do停下去做某事
stop doing停下某事

Answer 5

A they是复数不能用stops, stop to do 停下来（开始）做，stop doing停止做

Answer 6

a

停止这件事去做另一件事：stop to do sth.

停止做某事：stop doing sth.