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Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. What did he think of his short course in Nanping

A．It was interesting.
B．It was a valuable experience.
C．It was too far away from big cities.
D．It was a difficult course to teach.

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单项选择题

单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. What did he think of his short course in Nanping 您的浏览器不支持 audio 元素。