单项选择—Thereissomebodyatthedoor.Who

问题详情：

单项选择

—There is somebody at the door. Who ______ it be? Is it the postman?

       —No. It _______ be him. It’s just 7:00 o’clock. It’s too early.

     A. may, mustn’t   B. may, can’t              C. must, needn’t        D. can, may not

【回答】

B

知识点：情态动词

题型：选择题