21. The 'Mind the Gap' mantra is associated with which global metro system?
(A) Paris Metro
(B) Tokyo Metro
(C) New York City Subway
(D) London Underground
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統計: A(6), B(11), C(6), D(170), E(0) #3154197
統計: A(6), B(11), C(6), D(170), E(0) #3154197