Earth is believed to______by an object the size of Mars at some point in the dis

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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

解析这是一道语法题，考点是动词不定式完成时被动语态的用法。地球在那时已经被撞击了，因此用have been hit。

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