The dictionary I bought yesterday _____ me ten dollars.
A. is cost
B. cost
C. was cost
D. have been cost
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Einstein has ever said “Politics ____ much more difficult than physics.”
A. has
B. have
C. is
D. are
It’s necessary that _____ them to give us a hand.
A. we asked
B. we ask
C. we will ask
D. we asking
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