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These flowers ______, or they will die soon.

A. must water
B. must be water
C. must be watered
D. must be watering
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科目:初中英语 来源:广东省月考题 题型:单选题

These flowers ______, or they will die soon.
[     ]
A. must water
B. must be water
C. must be watered
D. must be watering

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