用括号内所给词的适当形式填空The trees must ______(water)three times a week at first.

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用括号内所给词的适当形式填空The trees must ______(water)three times a week at first.
用括号内所给词的适当形式填空
The trees must ______(water)three times a week at first.

用括号内所给词的适当形式填空The trees must ______(water)three times a week at first.
be watered 被浇水.

be watered;
被动语态,每天被浇水,water在此做动词表示浇水。