There is someone at the door. Who it be? Is it the postman?No it be him. It’s j

问题补充：

--- There is someone 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

答案：

(答案→)A. may, can’t

B. will, won’t

C. may, mustn’t

D. must, may not

解析：may可以，可能；will会，将要；must必须，一定；can’t不能，不可能；won’t不会；mustn’t禁止，句意：有人在敲门。可能是谁？是邮递员吗？——不，不可能是他。现在刚七点。太早了。结合语境可知选A。