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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 635

Loulan is believed ____ by sandstorms from AD 200 to AD 400.

A.to be gradually covered over
B.to have been gradually covered over
C.being gradually covered over
D.having been gradually covered over
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