单项选择题

A．before
B．when
C．then
D．since
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单项选择题
A．A lesson requires students’ active involvement.B．Students usually take an active part in a lecture.C．More knowledge is covered in a lecture.D．There is a larger group of people interested in lessons.
A．A lesson requires students’ active involvement.
B．Students usually take an active part in a lecture.
C．More knowledge is covered in a lecture.
D．There is a larger group of people interested in lessons.
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