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题库 > 语法SC > 题目73567h
It is possible that Native Americans originally have migrated to the Western Hemisphere over a bridge of land that once existed between Siberia and Alaska.
  • Ahave migrated to the Western Hemisphere over a bridge of land that once existed 分析该选项
  • Bwere migrating to the Western Hemisphere over a bridge of land that existed once 分析该选项
  • Cmigrated over a bridge of land to the Western Hemisphere that once existed 分析该选项
  • Dmigrated to the Western Hemisphere over a bridge of land that once existed 分析该选项
  • Ewere migrating to the Western Hemisphere over a bridge of land existing once 分析该选项
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正确答案: D

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