—How’s your tour around the North Lake? Is it beautiful?

—It          be, but it is now heavily polluted.

A．will

B．would

C．should

D．must

某机器字长为n，最高位是符号位，其定点整数的最大值为（）

A.2ⁿ-1

B.2^n-1-1

C.2ⁿ

D.2^n-1