He has planted a lot of trees.(改为被动语态)

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He has planted a lot of trees.(改为被动语态)

A lot of trees has been planted by him.

A lot of trees have been planted by him.

A lot of trees has been planted by him.

A lot of trees have been planted by him.

a lot of trees have been planted by him.

A lot of trees have been planted (by him).
用have ,主语是复数

呀,异笔同对(异口同声)

A lot of trees have been planted

A lot of trees have been planted by him.