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：why not +动词原形，stop to do sth 表示停下去做另一件事，stop doing sth 停下做原来的事，由原来前面的第一句话，可知，停下去做另一件事，故选C
