这些花必须经常浇水.The flowers___ ___ ___often.

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这些花必须经常浇水.Theflowers_________often.这些花必须经常浇水.Theflowers_________often.这些花必须经常浇水.Theflowers_________o

这些花必须经常浇水.The flowers___ ___ ___often.
这些花必须经常浇水.
The flowers___ ___ ___often.

这些花必须经常浇水.The flowers___ ___ ___often.
must be watered

should be watered

must be watered

must to water

should be watered

These flowers must be watered often.
so 填must be watered