题目内容

The flowers _______often.
A．must be water B．must be watered
C．must watered D．must water
B
此处考查情态动词后的被动式，情态动词后的被动式结构为must+be done, 因此可以排除A.C.D, 故选B.本句意思是：花必须经常浇。
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