Earth is believed to______by an object the size of Mars at some point in the distant past before its surface cooled.

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问题 Earth is believed to______by an object the size of Mars at some point in the distant past before its surface cooled.

选项 A、be hit
B、have hit
C、have been hit
D、being hit

答案C

解析 人们相信,在很久以前,那时地球还没有冷却下来,地球曾经被一个火星大小的 物体碰撞过。非谓语动词时态和语态的确定,主要是依据非谓语动词与句子主语之间的关系, 如果和主句主语之间是动宾关系,则用非谓语动词的被动语态,如果此动词的动作发生在主 句动作之前,则使用完成时态形式,本句中hit与句子主语之间是动宾关系,因此答案为C。
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