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    精英家教网 > 高中英语 > 题目详情
    16．It's ten years _________ the scientist set out to discover the valuable chemical．（　　）
    A．whenB．thatC．beforeD．since

    分析 自从这个科学家着手开始寻找有价值的化学物质已经有10年了．

    解答 答案：D．根据选项since自从…，before在…前，when当…时，再结合句意，自从这个科学家着手开始寻找有价值的化学物质已经有10年了，可知此处缺少了一个引导时间状语从句的连接词，故D 正确．句型It is/has been+一段时间+sincee…可翻译为，自从…已经多长时间…

    点评 本题考查时间状语从句的连接词，在充分分析句型再结合语义的基础上便能选出正确答案，同时要注意其他选项的意思

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