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This passage mainly tells the reader how ___.( )(本题2.5分)
A、 the London Underground works
B、 a passenger travels on a subway train
C、 a passenger buys a subway ticket
D、 the London Underground
A、 the London Underground works
B、 a passenger travels on a subway train
C、 a passenger buys a subway ticket
D、 the London Underground
参考答案