根据图样画法的最新国家标准规定，视图可分为（）。

A.基本视图、局部视图、斜视图和旋转视图四种

B.基本视图、向视图、局部视图、斜视图和旋转视图五种

C.基本视图、局部视图、斜视图和向视图四种

D.基本视图、向视图、斜视图和旋转视图四种

— 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