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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 2055

Wind power is an ancient source of energy ______ we may return in the near future.

A.from which B.to which C.on which D.by which
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Windpowerisanancientsourceofen