题目内容

【题目】---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

【答案】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。

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