单项选择题

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

A．Three-quarters of an hour.
B．Half an hour.
C．A quarter of an hour.
D．Ten minutes.

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单项选择题

单项选择题

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