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—Look! A book is on the floor.Whose is i...

—Look! A book is on the floor.Whose is it?

—It ________ be Rick's.It has his name on it.

A. mustn't    B. can't    C. must

 

C 【解析】句意:——看,地板上有本书,它是谁的?一定是瑞克的,上面有他的名字。A. mustn't禁止,千万别;B. can't表示很有把握的否定推测,意为"不可能" ;C. must必须,也可以表示很有把握的推测,其意为“一定,肯定”,只用于肯定句中,一般不用于否定句或疑问句。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,故答案选C。 点睛:情态动词表推测的用法很常见,情态动词表推测的三种句式: 1.在肯定句中一般用must (一定),may(可能),might / could(也许,或许)。 (1)He must/may/might know the answer to this question. 他一定/可能/也许知道这个问题的答案。 (2)It is cold in the room. They must have turned off the heating. 屋里很冷,他们肯定把暖气关了。 2.否定句中用can’t / couldn’t (不可能), may not/might not(可能不)。 (1)It can’t/ couldn’t be the headmaster. He has gone to America.这不可能是校长,他去美国了。 (2)He may not/might not know the scientist. 他也许不认识那位科学家。 3.疑问句中用can/could (能……?)。 (1)Could he have finished the task? 他可能把任务完成了吗? (2)Can he be at home now? 他现在能在家吗?  
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