We have planted many trees.改为被动语态Many trees ( )( )( )by us.改为被动语态一空一词

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We have planted many trees.改为被动语态Many trees ( )( )( )by us.改为被动语态一空一词
We have planted many trees.改为被动语态
Many trees ( )( )( )by us.改为被动语态
一空一词

We have planted many trees.改为被动语态Many trees ( )( )( )by us.改为被动语态一空一词
have been planted