Question

I'm sorry I can't stop           with you. I have much work to do.

1. A.
   to talk
2. B.
   talking
3. C.
   talk
4. D.
   talked

Answer 1

A
此题重点考查stop to do sth和stop doing sth之间的区别；前者表示停下来去做某事；后者表示停止做某事。