Lily is often heard ()a song in her room.Ato sing

问题描述:

Lily is often heard ()a song in her room.Ato sing
Lily is often heard ()a song in her room.
Ato sing
Bsinging
Csing
Dsings

B hear sb.do/ doing 改成被动 be heard to do/ doing
经常被听到 在唱歌,hear sb.do 是听到完整过程,听完
doing是听到在干嘛.
记得采纳一个答案,否则我们拿不了分,升不了级的,