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

試題分析:句意：人們都認為它是在公元200年到公元400年期間被風沙逐漸覆蓋的。固定句型：sb is believed to do “人們認為……”，相當于it is believed that +從句，故答案選C。
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