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【题目】—How often do I need to feed the birds?
—They food everyday,or they will be hungry.
A.must give
B.mustn't give
C.must be given

【答案】C
【解析】句意:—我需要多久喂一次这些鸟?-他们必须每天被给食物,否则他们会饿的。must give必须给;mustn't千万不要给;must be given必须被给。根据句意可知,句中的主语They代指的是the birds,它和动词give构成被动关系,因此这里应填被动语态,故选C。

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