I often hear him sing the same song被动语态He ____ often ____ ____ sing the same song.

问题描述:

I often hear him sing the same song被动语态
He ____ often ____ ____ sing the same song.

is heard

He was often heard to sing the same song.

He is often heard to sing the same song

He _is___ often __heard__ __to__ sing the same song.