题目内容
－How often do I need to feed the bird?
－They food every day, or they will be hungry.
A. must give B. mustn’t give C. must be given D. mustn’t be give
C
解析:被动语态。they即birds，they和give为被动关系。因此用被动语态，排除A和B 。由句意“必须每天给他们食，否则他们将非常饿。”故选C。
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