---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

試題分析：句意: 我需要多久喂一次鳥？必須每天喂食他們，否則他們會(huì)餓的。主語they 是動(dòng)作give的承受者，所以句子用被動(dòng)語態(tài)be given，故排除A B 項(xiàng)。帶情態(tài)動(dòng)詞的被動(dòng)語態(tài)基本結(jié)構(gòu)：情態(tài)動(dòng)詞+be +動(dòng)詞的過去分詞，must be given必須喂，mustn’t be given一定不要喂。據(jù)題意選C。
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