---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

解析試題分析:句意:----有人在敲門(mén),會(huì)是誰(shuí)呢?---不知道。也許是郵差。can be 表示肯定的猜測(cè),may be表示不確定的猜測(cè)。根據(jù)題意,故選C。
考點(diǎn):考查情態(tài)動(dòng)詞的用法。

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