Question

I heard Lucy ________ happily in her room when I passed her house.

A．sing

B．to sing

C．singing

D．sings

Answer 1

C

试题分析：句意：我经过Lucy 房间的时候听见她在房间里唱得很开心。hear 听见，感官动词，hear sb. doing sth. 听见某人正在做某事。由句意可知，我经过房间的时候Lucy 正在唱歌，故选C。