题目内容
Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
A. covered B. was covered C. to be covered D. to have been covered
D
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题目内容
Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
A. covered B. was covered C. to be covered D. to have been covered
D