问题补充：
The policeman did his best to make the baby.
A. to stop crying
B. stop crying
C. to stop to cry
D. stop to cry
答案：
A. to stop crying
(答案→)B. stop crying
C. to stop to cry
D. stop to cry
解析：句意：警察尽最大努力让那个婴儿停止哭泣。make sb do sth让某人做某事，不定式作make的宾语补足语省去to。stop doing sth停止正在做的事情，stop to do sth停下去做某事。故填B。
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