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    精英家教网 > 高中英语 > 题目详情
    6．---Argon，can I borrow your textbook？
    ---Sorry，not _____ you help make a note of what the teacher says．（　　）
    A．unlessB．ifC．whenD．since

    分析 -Argon，我可以借你的课本吗？
    -对不起，不行，除非你帮我记下老师说的话．

    解答 答案A．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．if"如果"，引导条件状语从句．when"在…时候"，引导时间状语从句．since意思是"自从…以来"时，引导时间状语从句；意思是"既然"时，引导原因状语从句．分析可知前后两句话之间是逻辑上的"条件"关系，可排除C和D；再结合句子所表达的意思"不行，除非你帮我记下老师说的话"可知答案选A．本句中的not相当于I will not lend you my textbook．

    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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