He was heard three songs in the next room.A. singB. to singC. singingD. sung

发布时间：2020-08-17 00:33:50

He was heard     three songs in the next room.
A. sing
B. to sing
C. singing
D. sung

网友回答

A. sing
(答案→)B. to sing
C. singing
D. sung
解析：考查不定式做补足语的用法：动词hear后面接宾语+不带to的不定式，变成被动式就是be heard to do，要还原to，句意：有人听见他在隔壁房间唱了三首歌。选B。
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