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搜尋:bauxite

      78. At present production levels, _________ deposits of bauxite can provide the world with aluminum for hundreds of years. 

      (A) known 

      (B) known are 

      (C) they are known 

      (D) what is known

      編輯私有筆記及自訂標籤
      答案:A
      難度:困難
      最佳解!
      pretest 高一下 (2017/05/12)
      At present productio☆ ☆☆☆☆☆☆, ...


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