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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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