单项选择题

Questions 18～21 are based on the following talk of a lab instructor.
At what point in the semester does this talk take place

A．At the beginning.
B．In the middle.
C．Near the end.
D．During the final exam.

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Questions 18～21 are based on the following talk of a lab instructor. At what point in the semester does this talk take place 您的浏览器不支持 audio 元素。