He _______ the 8:20 bus because he didn’t leave home till 8:25.

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问题 He _______ the 8:20 bus because he didn’t leave home till 8:25.

选项 A、couldn’t have caught
B、ought to have caught
C、shouldn’t have caught
D、must not have caught

答案A

解析 because引导的分句用了过去时，因此本句是对过去的推测。而根据他出门的时间，可知他肯定没有赶上车，要用couldn’t表否定推测，答案为A项couldn’t have caught。must表推测时只用于肯定句中，ought to have done表示“本应该”，shoudn’t have done表示“本不应该”。

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专业英语四级

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He _______ the 8:20 bus because he didn’t leave home till 8:25.

专业英语四级

Grainproductionintheworldis______,butstillmillionsgohungry.

A、Becausehiswifelikeshimtoworkforafirm.B、Becauseheprefersworkingforthegovernment.C、Becauseheplannedtodosel

(1)BecauseImarriedaphotographer,oncewehadchildren,ourholidaycardsofcoursebecamevehiclesfortheircutenessandh

(1)Therobotsinmoviesandsciencefictionbooksthatriseuptotakeovertheworldgenerallyareabletodosobecauseweha

(1)Moderntheatreaudiencesarelessabletounderstandclassicalplaysthanpreviousgenerationsbecauseofadecliningknowle

"It’ssaidthatyourjourneywasverypleasant."Thesentencemeansthat______.

Small________theroomis,itispleasantandairy.

Twentyyearsago,atallyoungwomanwithashysmileflubbedherlinesbeforemillionsofpeopleandbecameasuperstar.OnJul

Hello,everybody.Thankyouverymuchforinvitingmehere.It’sverypleasanttohaveachancetotalktoyouaboutsomethingt

矛盾同一性和矛盾斗争性的关系是（ ）

对于卵巢妊娠，下列哪项叙述不恰当

外源性支气管哮喘，浆细胞产生使人体致敏的抗体是

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矛盾同一性和矛盾斗争性的关系是（　　　）