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    精英家教网 > 高中英语 > 题目详情

    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。
    考点：考查非谓语动词。

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