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?

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.