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请把这句话中，as引导的结构改写成由一个先行词和一个关系代词引导关系从句组成的结构。It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed.对不起，应该是把准关系代词than 引导的结构改写为由一个先行词和一个由关系代词引导的关系从句组成的结构。
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It seems that man was making a real effort to understand the seasons 20,000 years earlier than
those have been supposed.those 代seasons，不知道对不对。
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