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单选题
23. Larry Rosen advises other professors not to follow Duncan＇s lead because
A
it may work at the beginning, but the temptation is too strong
B
jit can only work well with some students but not with others
C
it works for a short while before most students get anxious
D
it really distracts heavy users, who actually pretend to listen
答案解析
正确答案：C
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