单项选择题

A．About every five minutes.
B．About every six minutes.
C．About every seven minutes.
D．About every eight minutes.
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单项选择题
A．The cost of the ticket.B．The number of the platform.C．The ticket machine.D．The stops of the train.
A．The cost of the ticket.
B．The number of the platform.
C．The ticket machine.
D．The stops of the train.
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