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    精英家教网 > 初中英语 > 题目详情
    ---How often do I need to feed the birds?
    ---They______ food every day, or they will be hungry.
    A．must giveB．mustn’t give
    C．must be givenD．mustn’t be given
    C

    试题分析：句意: 我需要多久喂一次鸟？必须每天喂食他们，否则他们会饿的。主语they 是动作give的承受者，所以句子用被动语态be given，故排除A B 项。带情态动词的被动语态基本结构：情态动词+be +动词的过去分词，must be given必须喂，mustn’t be given一定不要喂。据题意选C。
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