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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 163

No one knows exactly when our ancestors started talking,but new evidence suggests  _______might have happened a long time ago.

A.which B.what C.it D.they
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Nooneknowsexactlywhenourancest