Question

The little boy         sing in his room last night.

A. heard to     B. is heard to

C. was heard      D. was heard to

Answer

D

【解析】

试题分析：句意为：这个小男孩昨晚被听到在房间里唱歌。hear sb do sth表示听到某人做过某事，hear sb doing sth表示听到某人正在做某事。根据语境可知，这里叙述的是过去的事实，即听到某人做过某事。而主语是动作的承受者，应用被动语态。在被动语态中，省略to的动词不定式应还原to。故应选D。

考点：考查被动语态的用法。