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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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 |