题目内容
---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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