容量为1G的硬盘，最多可以存储的信息量是（）。

A.1024MB字节

B.1024KB字节

C.1000KB字节

D.1000MB字节

---I rang you yesterday afternoon. A man answered, but I didn’t recognize the voice.

--- Oh, it ____ my uncle. He was in my room then.

A．must have been

B．should have been

C．must be

D．should be