—The presidents of China and the USA had ________ interview a short time ago.

—And it was ________ great success.

A．an; /

B．the; a

C．an; a

D．the; /

DOS系统中组合键Ctrl+Break的功能是（）

A、重启动

B、中断正在执行的命令或程序

C、联机打印

D、继续当前操作