Friday afternoons.many students are sleepy after a long week of classes． A．In B．On C．At 题目和参考答案——青夏教育精英家教网——

题目内容

_____Friday afternoons，many students are sleepy after a long week of classes．
A．In B．On C．At

B

考察介词.在表示时间时,in表示在一个时间范围,on表示在具体某一天,at表示在具体时刻.根据题意,星期五下午是具体某一天,故选B.

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