The flowers must ________(water)every day.
问题描述：
The flowers must ________(water)every day.
答
The flowers must be watered every day.
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答
be watered
答
The flowers must (be watered,被浇水) every day.
这些花必须每天被浇水.
这个是含有情态动词的被动语态.花和浇水是被动的关系.