---There’ssomebodyatthedoor.Who

问题详情：

 --- There’s somebody at the door. Who _____ it be? Is it the postman?

  --- No, it _____ be him. It’s just seven o’clock. It’s too early.

  A. may; can’t    B. will; won’t    C. may; mustn’t    D. must; may not

【回答】

A

知识点：情态动词

题型：选择题