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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1658

We know that about seventy percent _____ the earth _____ covered by water.

A./; is B.of; are
C.of; is D.about; are
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Weknowthataboutseventypercentt