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---There is someone knocking at the door...

---There is someone knocking at the door. Who_______ it be?

---I'm not sure. It_______ be a postman.

A. may; must B. will; can C. can; may D. may; will

 

C 【解析】 试题分析:英语中有些情态动词,通过使用不同的时态形式,可以表示“推测”的含义。1. 情态动词 + 动词原形:must + 动词原形,表示对现在的事实进行非常有把握的推测,一般用于肯定句。如:There must be something wrong. 一定是出了什么差错。may / might / can / could + 动词原形,表示对现在、未来事情发生的可能性的推测。此时, might, could 不表示过去,只是表示推测的语气更加不肯定。一般情况下, may, might 用于肯定句中; can, could 用于否定句、疑问句中。根据语境可知敲门的人可能是谁呢?不确定有可能是邮递员,故选C。 考点:考查情态动词表示推测的用法。  
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