If you feel tired you may stop.A. have a restB. to have a restC. having a restD. has a re

问题补充：

If you feel tired, you may stop.

A. have a rest

B. to have a rest

C. having a rest

D. has a rest

答案：

A. have a rest

(答案→)B. to have a rest

C. having a rest

D. has a rest

解析：句意，如果你感觉累，你可以停下来休息。stop to do sth.停下来去做某事；stop doing sth.停止做某事，故选B。