Earth is believed to ______ by an object the size of Mars at some point in the d

游客2025-03-26 18

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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Earthisbelievedto______byanobjectthesizeofMarsatsomepointinthed