单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Try the train ticket instead.
B．Book an air ticket in advance.
C．Wait for others to cancel their booking.
D．Buy a ticket at a higher price.

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Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。