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—Whose bike is this? —I am not sure. It_...

—Whose bike is this?

—I am not sure. It______________ be Mary’s.

A. shall    B. must    C. might

 

C 【解析】句意:----这是谁的自行车?------我不清楚。可能是玛丽的。考查情态动词表推测。A. shall应该;将要;B. must必须,一定;C. might可能。Must和might都可以表推测,must的可能性接近百分之百,而might的可能性较小。根据回答I am not sure.(我不清楚。)可知可能性不高。结合句意和语境可知选C。 点睛:表推测的情态动词有must,may, might, can could;1.must 表示很有把握的推测,其意为“一定会”“肯定会”,只用于肯定句。My math teacher must be in the office because the light in his office is on! 我的数学老师一定在办公室里,因为他办公室的灯亮着!2. May, Might, could的可能性不must小,Might, could 比 may 语气更不确定,表示的可能性更小。He may [might] not believe you. 他可能不会相信你。3. can 通常只用于否定句或疑问句,一般不用于肯定句,而could 可用于肯定句、否定句和疑问句。两者没有时间上的差别,只是could 比 can 更委婉,更不确定。如:It can’t [couldn’t] be true. 那不可能是真的。What can [could] they be doing? 他们会在干什么呢? We could go there this summer. 今年夏天我们可能要去那儿。  
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