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单选题
The flowers _____ often.
A
must be water
B
must be watered
C
must watered
D
must water
参考答案
参考解析
解析：
句意：需要经常浇花。此处考查情态动词后接被动式（must+be done），故选B。
句意：需要经常浇花。此处考查情态动词后接被动式（must+be done），故选B。
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