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

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A. have a rest
(答案→)B. to have a rest
C. having a rest
D. has a rest
解析：
stop doing 停止做某事（doing 作宾语）例：We stopped talking. 我们停止说话。
stop to do 停下来去做某事（to do 表示停下来的目的，作状语）例：We stopped to talk.   我们停下来说话。故选B表示目的：停下来的目的是休息。