问题
_______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;
B:While, which
C:While, what
D:When, that;
正确答案是：
同类题型
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