They are said______each other long time before they met in Harvard University where they worked together on a research project.

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问题 They are said______each other long time before they met in Harvard University where they worked together on a research project.

选项 A、to know
B、to have known
C、knowing
D、having known

答案B

解析 to have known不定式完成式表示过去已经发生的情况。

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在职攻硕英语联考

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They are said______each other long time before they met in Harvard University where they worked together on a research project.

在职攻硕英语联考

Thequestionofwhetherwarisinevitableisonewhichhasconcernedmanyoftheworld’sgreatwriters.Beforeconsideringthis

Ienjoyedmyselfsomuch______Ivisitedmyparentsinthecountrysidelastyear.

Ironically,theintellectualtoolscurrentlybeingusedbythepoliticalrighttosuchharmfuleffectoriginatedontheacademic

Allthekeywordsinthearticleareprintedin______typesoastoattractreaders’attention.

Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand

Everytimeapersoneatssomethinghemakesanutritionaldecision.Heacceptsorrejectsthefoodavailabletohimathomefor

BeforehighschoolteacherKimberlyRughgotdowntobusinessatthestartofarecentschoolweek,shejokedwithherstudents

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Alineinasongasks,"Doesanyonereallyknowwhattimeitis?"Thisquestioncouldeasilyapplytocalendars!Didyouknowth

Wewouldn’thaveimaginedit?Afteryearsontop,Nikesuddenlylookslikeaworld-classmarathonerwho,inmid-race,questions

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