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    精英家教网 > 高中英语 > 题目详情

    ________regular exercise is very important, it's never a good idea to exercise too close to bedtime.

    A．If               

    B．As  

    C．Although        

    D．Unless

    C解析：第一个句子在说经常锻炼的好处，第二句子则说快要睡觉时锻炼是不好的，由此可知二者之间存在转折或让步关系。if“如果”，引导条件状语从句；as“当……的时候”，引导时间状语从句，虽然as还有“虽然，尽管”的含义，可用来引导让步状语从句，但此时从句必须用倒装，即把名词、形容词等提到as的前面；although“虽然，尽管”，引导让步状语从句；unless“如果不，除非”，引导条件状语从句。句意：虽然经常锻炼是很重要的，但是快到睡觉的时间锻炼绝不是一个好主意。故选C项。

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