单项选择题

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

A．Once a week.
B．Twice a week.
C．Three times a week.
D．Four times a week.

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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。