[解析] M: Do you like MarkW: He is the last person I want-找考题网

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单项选择题A. When the students have done good work. B. After the first laboratory session. C. At the beginning of the semester. D. When the students need to be motivated.

A. When the students have done good work.
B. After the first laboratory session.
C. At the beginning of the semester.
D. When the students need to be motivated.

单项选择题B

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