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题文

—How often do I need to feed the fish?
-They _______ food every day, or they will be hungry.

A.must give B.mustn’t give C.mustn’t be give. D.must be given
科目 英语   题型 单选题   难度 中等
知识点: 主语+系动词+表语 情态动词的被动语态 语态的辨析
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