一道英语选择题(请进!请详细说明!谢谢!)
Theresearchbeganto________howtomanufactureopticalfibersatlowcost.AplaceemphasisonBmee...
The research began to ________ how to manufacture optical fibers at low cost.
A place emphasis on
B meet the challenge of
C have profound impact on
D take the responsibility for 展开
A place emphasis on
B meet the challenge of
C have profound impact on
D take the responsibility for 展开
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