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【题目】_______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

【答案】C
【解析】考查状语从句和宾语从句。句意:尽管从蒸汽机到互联网花费了200年的岁月,但是这可能是最近十年现在被认为的科学尖端的主要发展。While尽管,引导让步状语从句;in后面是介词的宾语从句,从句缺少引导词,缺少主语,可知第二空填what。故选C。

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