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  • 更新 2022-09-04
  • 科目 英语
  • 题型 选择题
  • 难度 中等
  • 浏览 68

Putting out forest fire is regarded as one of _____ problems in the world.(  )

A.

difficult

B.

more difficult

C.

most difficult

D.

the most difficult

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Puttingoutforestfireisregarded