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外语
Earth is believed to______by an object the size of Mars at some point in the distant past before its surface cooled.
Earth is believed to______by an object the size of Mars at some point in the distant past before its surface cooled.
admin
2015-12-09
47
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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成人本科学位英语
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