Earth is believed to______by an object the size of Mars at some point in the distant past before its surface cooled.

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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

解析人们相信，在很久以前，那时地球还没有冷却下来，地球曾经被一个火星大小的物体碰撞过。非谓语动词时态和语态的确定，主要是依据非谓语动词与句子主语之间的关系，如果和主句主语之间是动宾关系，则用非谓语动词的被动语态，如果此动词的动作发生在主句动作之前，则使用完成时态形式，本句中hit与句子主语之间是动宾关系，因此答案为C。

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Earth is believed to______by an object the size of Mars at some point in the distant past before its surface cooled.

在职攻硕英语联考

Recentresearchfromanimalbehavioristssuggeststhat"asthecrowflies"shouldnolongerbetakentomean"theshortestdista

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DuringthetwoyearsthatpassedbetweenthedeathofhisfatherandhisestablishmentinLondon,Gibbonhadmadeapreliminary

By1830theformerSpanishandPortuguesecolonieshadbecomeindependentnations.Theroughly20million【C1】______ofthesenati

Itwastwoyearsagotodaythatthehuntingbancameintoforce,supposedlyendingcenturiesoftradition.However,thelawhas

Eachworkday,theworkersfollowedthesameschedulesandrarely______fromthisroutine.

CantheInternethelppatientsjumpthelineatthedoctor’soffice?TheSiliconValleyEmployersForum,asophisticatedgroupo

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