2. 外语
  3. 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.

admin2015-12-09  23
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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