——Hi, Mike．Any idea where Mary is?

——She ____ in the classroom．I saw her there just now.

A．shall be

B．should have been

C．must be

D．might have been

微型计算机的内存储器是( )。

A． 按二进制位编址

B．按字节编址

C． 按字长编址

D． 按十进制位编址