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_______it took 200 years to move from the steam engine to the Internet, there could be major development in _______ are now considered frontiers(尖端) of science in just the past few ten years.

A. When, which   B. While, which

C. While, what    D. When, that

高一英语单项填空中等难度题

少年,再来一题如何?
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