it was my sister whom sent the book .

이문장은 틀린문장인가요 ?? 어법상 옳은거 고르라는데

정답은 it is mike who likes listening to music.

이거라고 되어있는데

it was my sister whom sent the book. 이문장은 whom 을 쓸수 없나요???

전에 사람강조할때 who 나 whom 둘다가능하다고 본거같아서요