【題目】_______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】考查狀語從句和賓語從句。句意：盡管從蒸汽機(jī)到互聯(lián)網(wǎng)花費(fèi)了200年的歲月，但是這可能是最近十年現(xiàn)在被認(rèn)為的科學(xué)尖端的主要發(fā)展。While盡管，引導(dǎo)讓步狀語從句；in后面是介詞的賓語從句，從句缺少引導(dǎo)詞，缺少主語，可知第二空填what。故選C。

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