The little boy was heard in the street when night fell down yesterday .A. cryB. criesC. c

问题补充：

The little boy was heard in the street when night fell down yesterday .

A. cry

B. cries

C. cried

D. crying

答案：

A. cry

B. cries

C. cried

(答案→)D. crying

解析：考察非谓语动词。句意：当昨天夜幕降临时，有人听见这个小男孩正在街上哭。现在分词作宾语补足语表示被修饰词正在进行的伴随性动作，和被修饰词是主谓关系，结合语境可知选D。