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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1060

--- Red-crowned cranes need more people’s help.
---Yes. People working in the reserves are doing everything they can ____these birds.

A.save B.saving
C.to save D.to saving
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Redcrownedcranesneedmorepeople