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Questions 11 - 13 are based on the following conversation. You now have 15 seconds to read Questions 11 - 13. What service must be paid for

A．Computer classes.
B．Training sessions.
C．Laser printing.
D．Package borrowing.

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单项选择题

单项选择题

Questions 11 - 13 are based on the following conversation. You now have 15 seconds to read Questions 11 - 13. What service must be paid for 您的浏览器不支持 audio 元素。