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    精英家教网 > 高中英语 > 题目详情
    17．Today，when scientists examine mummies，they wear special clothing for protection _____ they breathe in harmful gas．（　　）
    A．even thoughB．in caseC．untilD．unless

    分析 今天，科学家们在检查木乃伊的时候，他们穿着特殊的服装作为保护以防他们吸入有害气体．

    解答 答案B．
    even though"尽管，即使"，引导让步状语从句．in case"以防，以免，万一"，引导条件状语从句．until"直到"，引导时间状语从句．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．分析可知前后两句话之间是逻辑上的"条件"关系，再结合句子所表达的意思可知答案选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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