题目内容

—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：你多久喂一次鱼？他们每天都必须被喂食，否则他们会饿。主语they指鱼，是动作的承受者，故用被动结构：be + done,含有情态动词的被动结构：情态动词+ be + done，结合句意及句子结构，故选D
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