— There is somebody at the door, who            it be? Is it the postman?

— No, it            be him, it's just six o'clock. It's too early. [ ]

A. may; can't

B. may; mustn't

C. will; won't

D. must; may not

大便干结，面色无华，心悸气短，失眠多梦，健忘，舌淡苔白，脉细。治宜首选（）

A.平胃散

B.香砂六君汤

C.温脾汤

D.温胆汤

E.润肠丸