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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 926

More bison were killed.The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.

A.to have fallen B.having fallen
C.to fall D.falling
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Morebisonwerekilled.Thebisonpo