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Itseemsthatmanwasmakingarealefforttounderstandtheseasons20,000yearsearlierthanhasbeensupposed中than前后的时态不一样求分析

题目详情
It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed中than前后的时态 不一样 求分析
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答案和解析
这句是在 has been supposed 前省略了 what
意思是人类似乎早就在关注并尝试了解季节(的变化),比原先设想的还早了2万年.