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Questions 17～20 are based on the following talk. You now have 20 seconds to read the questions 17～20. What is suggested if you want to keep your friends

A．Write letters carefully.
B．Write back promptly.
C．always use nice words.
D．Write letters with a proper style.

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单项选择题

Questions 17～20 are based on the following talk. You now have 20 seconds to read the questions 17～20. What is suggested if you want to keep your friends 您的浏览器不支持 audio 元素。