题目内容

According to the survey, how many of the college students in the U.S. say they enjoy their

A. Nearly 20%.
B. More than 25%.
C. About 33.3%.
D. Nearly 66.7%.

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They required that all the necessary documents ______ to the president's office before the

A. be handed
B. must be handed
C. should hand in
D. had been handed in

【B7】

A. probable
B. hopefully
C. then
D. still

I bought a new house last year, but I ______ my old house yet, so at the moment I have two

A. did not sell
B. have not sold
C. had not sold
D. do not sell

计算机的时钟周期就是计算机的主频。（）

A. 正确
B. 错误