Earth is believed ______ by an object the size of Mars at some point in the distant past  
before its surface cooled．
A．to be hitB．to have hit C．to have been hitD．to hit
C
考查非謂語動(dòng)詞。根據(jù)句意可知事情已經(jīng)發(fā)生，故用不定式的完成式，earth與hit為被動(dòng)關(guān)系，故用被動(dòng)，選C。
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