By 1990, despite the network having increased to（） kilometers.
A.38,000
B.48,000
C.58,000
D.68,000
正确答案：58,000
By 1990, despite the network having increased to（） kilometers.
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By 2005, China's network was the second busiest freight carrier and carried nearly （） percent of the world’s freight tra
In（）, Chengyu Railway (Chengdu – Chonqing) was completed and put into use, and it was the first railway built since the founding
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