It is believed to _____ over by sandstorms from AD 200 to AD 400.

A. gradually cover B. be gradually being covered

C. have been gradually covered D. be gradually covered

 

C

【解析】

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。

考點：考查非謂語動詞。

 

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