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问题 选择题

Their classroom            every day.            [ ]

A. was cleaned

B. is cleaned

C. is cleaning

D. clean

答案

答案：B

名词解释

硬膏
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选择题

—The authors of computer viruses are geniuses.

—I agree. If they applied their wisdom to other net technology _____ human beings can benefit, it would be better.

A．in which

B．through which

C．from which

D．during which
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