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7.-Look!A book is on the floor.Whose is it?
-It ______be Rick's.It has his name on it.(  )
A.mustn'tB.can'tC.mustD.need

分析 --看,地板上有本书.是谁的?
--一定是瑞克的.上面有他的名字.

解答 答案:C  情态动词表推测的用法.must 表示很有把握的推测,其意为"一定""肯定",只用于肯定句,一般不用于否定句或疑问句;can't表示很有把握的否定推测,意为"不可能";need需要.根据It has his name on it.上面有他的名字.推测可知一定是瑞克的.表示很有把握的推测,故选C.

点评 主要考查情态动词表推测的用法.一定注意情态动词的含义和用法,然后根据句意,来推测所需的情态动词.本题主要考查must的用法.

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