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.

admin2009-01-13  86
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 本题考查非谓语动词，首先本句应使用动词不定式的完成式，表示动作己完成(非谓语动词动作发生在前)。其次要注意语态，本句应使用被动语态，所以综合考虑应该选C。
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