The boy stopped TV and went to do his homework when his mother came back.A. watch B. watch

问题补充：

The boy stopped TV and went to do his homework when his mother came back.

A. watch B. watching C. to watch

答案：

解析：此题重点考查两个短语stop to do sth和stop doing sth的区别，前者表示停下来去做某事，后者表示停止做某事。根据语境可知此句的含义是当妈妈回来以后，这个小男孩不再看电视然后去做作业，故选B。