问题补充：
You must be very tired. Why not a rest?
A. to stop to have
B. to stop having
C. stop to have
D. stop having
答案：
A. to stop to have
B. to stop having
(答案→)C. stop to have
D. stop having
解析：句意：你一定非常累了。为什么不停下来休息一下呢？Why not do sth意为“为什么不做某事呢”，stop to do sth意为停下正在干的事情去做别的事情，而stop doing sth意为“停止正在干的事情”；故选C。
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