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--I wonder where Tom is, --I am not sure...

--I wonder where Tom is,

--I am not sure. He           be in the library.

A. must    B. can't    C. might    D. should

 

C 【解析】句意:——我想知道汤姆在哪里,——我不确定。他可能在图书馆。A. must必须,一定;B. can't不可能; C. might 或许; D. should应该。根据I am not sure.判断,此处表示没有把握性的推测,只能用might,答案为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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