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Earth is believed ______ by an object the size of Mars at some point in the distant past before itss

题目简介

Earth is believed ______ by an object the size of Mars at some point in the distant past before itss

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 hit	B．to have hit
C．to have been hit	D．to hit

题型：单选题难度：中档来源：不详

答案

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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