Some Martian rock structures look strikingly like structures on Earth that are known ______ by microbes.

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问题 Some Martian rock structures look strikingly like structures on Earth that are known ______ by microbes.

选项 A、having been created
B、being created
C、to have been created
D、to be created

答案C

解析空格所在的定语从句为“sth．be known to do”结构，因此排除A、B项。that指代structures on Earth，与created之间存在被动关系，故要用被动式，C、D都符合。地球的岩石结构早已由微生物创造出来，即created动作先于are known发生，故选C。

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专业英语四级

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Some Martian rock structures look strikingly like structures on Earth that are known ______ by microbes.

专业英语四级

AmericanFamiliesI.TypesofAmericanfamilies—thetraditionalAmericanfamily:aworkingfather,a【T1】,【T1】________and

A、Sheisfascinatedwithsports.B、Sheisreliableandpowerfulinside.C、ShehasgotaJapanesesportscar.D、Shedoesn’tknow

(1)JustwhenTransportforLondon(TfL)thoughtthebikehireschemeprovidedananswertoLondon’scarbonemissionsproblem,th

(1)We’realwaysbeingtoldbytheDepartmentofHealthtoeatfiveportionsoffruitandvegetablesaday.Butit’snotclearw

A、Heattachesmoreimportancetofootballthanhisgirlfriend.B、Hehasbrokenupwithhisgirlfriendbecauseofsports.C、Hisg

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