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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統計: A(8), B(11), C(172), D(0), E(0) #3154198
統計: A(8), B(11), C(172), D(0), E(0) #3154198