单项选择题

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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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