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    精英家教网 > 高中英语 > 题目详情
    Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.
    A．to be hitB．to have hit
    C．to have been hit D．to hit
    C

    试题分析：句意：人们相信，地球在其表面冷却之前被类似火星大小的物体撞击过。分析语境可知主语Earth和hit之间为动宾关系，所以用被动语态。“被撞击”be hit这个动作发生在“冷却”cool这个动作之前，故用完成时态。故选C。
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