I really appreciate _____ some time to surf the Internet. But I'm too busy. [ ]

A. to have

B to having

C. have

D. having

从基础模数尺寸与人的关系看，基础模数尺寸是适合人体操作的（）。

A．最低限尺寸

B．最高限尺寸

C．适合的尺寸

D．不适合尺寸