He promised me a letter; he ought to ______ it days ago.

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问题 He promised me a letter; he ought to ______ it days ago.

选项 A、have written
B、write
C、had written
D、be writing

答案A

解析本题测试的重点是情态动词ought to后不定式的时态形式。根据英语语法规则，ought to或 should加不定式原形在时间上相当于动词的现在时；ought to或should加不定式的完成时在时间上相当于动词的过去时或现在完成时。在本句中，时间状语days ago已经决定了句中的谓语动词一定是过去时，即ought to have done something，因此只有A项符合要求，意为“他本该几天前就给我写信了”。

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考博英语

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He promised me a letter; he ought to ______ it days ago.

考博英语

Computersmayonedayturnnightintoday—withgoodold,naturalsunlight.Giantcomputer-controlledmirrors,thousandsoff

Perhapsallcriminalsshouldberequiredtocarrycardswhichread:Fragile;HandlewithCare.Itwillneverso,thesedaystog

AnotherfactorinthedisplayofartobjectsAconcernstheircontinuedpreservation.Becauseofthesensitivityofsomeofthem

Surprisinglyenough,modernhistorianshaverarelyinterestedthemselvesinthehistoryoftheAmericanSouthintheperiodbefo

Theeffectofthebabyboomontheschoolshelpedtomakepossibleashiftinthinkingabouttheroleofpubliceducationinthe

TheCommercialRevolutionwasnotconfined,ofcourse,tothegrowthoftradeandbanking.Includedinitalsowerefundamental

Theanalysissuggeststhatthetradeoffbetweenourchildren’scollegeandourownretirementsecurityischilling.

AmongthefirsttocomeandliveinNorthAmerica______,wholaterprosperedmainlyinNewEngland.

Thiscycleofgrowth,reacheditspeakin1986,whentheannualrateofgrowthwas______12percent.

Theaccommodationwasatacomfortablehotel,themeetingfacilities______.

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APPOINTMENTSYOUNGItaliangirl,student,speaksEnglishandFrench,seekspostinaschoolorfamily,givinglessonsorlo