单项选择题

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

A．They ought to make fresh coffee.
B．They ought to try some other kinds of coffee.
C．The machine should be cleaned.
D．The machine should be replaced.

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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。