this song is often sung by children.句中by children算是什么状语呢?

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this song is often sung by children.句中by children算是什么状语呢?
this song is often sung by children.句中by children算是什么状语呢?

this song is often sung by children.句中by children算是什么状语呢?
by +.在被动语态中作方式状语,表示动作执行的方式或对象.