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---There is somebody 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:句意:----有人在敲门,会是谁呢?---不知道。也许是邮差。can be 表示肯定的猜测,may be表示不确定的猜测。根据题意,故选C。
考点:考查情态动词的用法。

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