1.We must water these young trees ofen,(改为被动语态).

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1.We must water these young trees ofen,(改为被动语态).

1.We must water these young trees ofen,(改为被动语态).
1.We must water these young trees ofen,(改为被动语态).

1.We must water these young trees ofen,(改为被动语态).
these young trees must be watered often

These young trees must often be waterred.

These young trees must be watered often by us.
注释:water的过去分词直接加ed,不能双写r