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题型:单选题 题类:常考题 难易度:普通

江苏省如东高级中学2016-2017学年高一下学期期中考试英语试题

As a stopping point on the famous Silk Road, Loulan is believed __________  by sandstorms from AD 200 to AD 400.

A、to be gradually covered over B、to gradually cover over C、to have been gradually covered over D、to gradually have covered over
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