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—How often do I need to feed the fish?
-They _______ food every day, or they will be hungry.
A.must giveB.mustn’t giveC.mustn’t be give.D.must be given
D

试题分析:句意:——我需要多久喂一次鱼?——必须每天给他们食物,否则,他们会饿的。must“必须”,mustn’t“禁止”。结合句意,是必须喂食物故排除BC两项。主语They与谓语give之间是被动关系,故选D。
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