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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 402

About 71% of the earth’s surface ______ covered with water, but 20% of the world population ______ have access to safe drinking water.

A.is; doesn’t B.are; don’t C.are; doesn’t D.is; don’t
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About71%oftheearth’ssurfacecov