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By 1910, the US topped the world in railway mileage at over －－（） miles.

By 1910, the US topped the world in railway mileage at over --（） miles.
A.200,000
B.300,000　
C.400,000　
D.500,000
正确答案： 400,000

标签：中外铁路文化之旅

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