Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.
A．to be hitB．to have hit
C．to have been hit D．to hit
C

試題分析：句意：人們相信，地球在其表面冷卻之前被類(lèi)似火星大小的物體撞擊過(guò)。分析語(yǔ)境可知主語(yǔ)Earth和hit之間為動(dòng)賓關(guān)系，所以用被動(dòng)語(yǔ)態(tài)�！氨蛔矒簟眀e hit這個(gè)動(dòng)作發(fā)生在“冷卻”cool這個(gè)動(dòng)作之前，故用完成時(shí)態(tài)。故選C。
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