I heard someone play the piano in the music room an hour ago.改为被动语态
问题描述：
I heard someone play the piano in the music room an hour ago.改为被动语态
答
Someone playing the piano in the music room was heard by me an hour ago.
答
Someone was heard to play the piano in the music room an hour ago (by me).
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答
Someone was heard to play the piano in the music room an hour ago by me.