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5.You'd better take down all the key points         the memory is still fresh in your mind.(  )
A.unlessB.whileC.beforeD.until

分析 当记忆犹新的时候,你最好把所有的要点记下来.

解答 答案B.unless"除非,如果不",在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用,引导条件状语从句.while表示"当…的时候",引导时间状语从句;意为"尽管、虽然",引导让步状语从句;意为"而、但是",引导比较状语从句.before"在…之前",引导时间状语从句.until"直到",引导时间状语从句.分析可知前后两句话是逻辑上的"时间"关系,可排除A项."把所有的要点记下来"和"记忆犹新"中的动作同时或者几乎同时发生,故排除C项.如果选用until,句子的意思不通顺,可排除D项,故答案选B.

点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的逻辑关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.

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