Question

He was heard________ three songs in the next room.

A．sing

B．to sing

C．singing

D．sung

Answer 1

B

试题分析：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。
点评：hear sb do听见某人做了，hear sb doing听见某人正在做，hear +宾语+ done，听见…被怎样。