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    15．It's already tens of years____the world's population reached five billion．（　　）
    A．beforeB．afterC．since

    分析 自从世界人口达到50亿已经几十年了．

    解答 答案：C；
    根据设空处前面的It's already tens of years，联系语境可以推测句意是"自从世界人口达到50亿已经几十年了．"表示"自从"用since；故选C．

    点评 平时学习过程中，掌握连词的意思，及所表示的关系是至关重要的，这种关系的判断可以通过句子意思的理解来选择恰到的连词．

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