问题补充：
At last, Lucy make the baby and the baby began to laugh.
A. stop crying
B. to stop crying
C. stop to cry
D. to stop to cry
答案：
(答案→)A. stop crying
B. to stop crying
C. stop to cry
D. to stop to cry
解析：句意：最后，Lucy让小孩停止了哭，并且开始笑起来。Make sb. do sth.使某人做某事，后接动词原形做宾补；排除B和D。stop doing sth.停止做某事；stop to do sth.停下来去做某事；结合语境故选A。
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