题目内容

It’s necessary that _____ them to give us a hand.

A. we asked
B. we ask
C. we will ask
D. we asking

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That was not the first time he _____ us. I think it is high time we _____ strong actions against him.

A. betrayed, take
B. had betrayed, took
C. has betrayed, took
D. has betrayed, take

计算机使用中断的方式与外界交换信息时,保护现场的工作应该是( )。

A. 由CPU自动完成
B. 在中断响应中完成
C. 由中断服务程序完成
D. 在主程序中完成

中断处理的全过程分为()、() 、中断处理和中断返回。

简述时钟系统的功能。

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