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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2060

The split between humans and living apes is thought by some scholars ____ 15 to 20 million years ago.

A.to occur B.occurring C.to have occurred D.having occurred
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Thesplitbetweenhumansandliving