Question

The flowers must ________(water)every day.

Answer 1

为你解答。
The flowers must (be watered，被浇水) every day.
这些花必须每天被浇水。
解释：这个是含有情态动词的被动语态。花和浇水是被动的关系。

Answer 2

The flowers must  be watered every day.

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Answer 3

be watered