单项选择题

Questions 18-21 are based on the following conversation. You now have 20 seconds to read the questions 18-21. When does the conversation take place

A．In the middle of the semester.
B．At the beginning of exams.
C．At the end of the school year.
D．In the middle of summer vacation.

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单项选择题

单项选择题

Questions 18-21 are based on the following conversation. You now have 20 seconds to read the questions 18-21. When does the conversation take place 您的浏览器不支持 audio 元素。