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It is believed to _____ over by sandstorms from AD 200 to AD 400.
A.gradually coverB.be gradually being covered
C.have been gradually coveredD.be gradually covered
C

试题分析:句意:人们都认为它是在公元200年到公元400年期间被风沙逐渐覆盖的。固定句型:sb is believed to do “人们认为……”,相当于it is believed that +从句,故答案选C。
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