22. Which metro system's inception marks the beginning of round-the-clock service in the urban transit
realm?
(A) Moscow Metro
(B) Delhi Metro
(C) New York City Subway
(D) Seoul Metropolitan Subway
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Across the pond, the...
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22. 哪個地鐵系統的開通標誌著城市交通...
阿摩線上測驗
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