Earth is believed _____ by an object the size of Mars at some point in the distant past before its surface cooled. [ ]A. to be hit B. to have hit C. to have -高中英语-n多题

◎ 题干

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

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

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◎ 解析

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◎ 知识点

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