单项选择题

Questions 16 to 18 are based on the passage you have just heard.

A. Twenty-four hours a week. B. Twenty-eight hours a week.
C. Twenty hours a week. D. Eight hours a week.

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单项选择题

Questions 16 to 18 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。