题目内容

12．-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

分析 -我需要多久喂一次鸟？-它们每天都要喂，否则它们会饥饿．

解答 答案：C．答句中they代指the birds，是动作的承受者，所以用被动语态；又根据or they will be hungry．可知是每天必须喂，所以用情态动词的被动语态，其构成为：情态动词+be+过去分词，give的过去分词为given，故选C．

点评 本题考查情态动词的被动语态，其构成为：情态动词+be+过去分词，要掌握其表示的含义，在不同的语言环境中达到熟练掌握的目的．

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