You______John in the street this morning. He’s been dead for ages.

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问题 You______John in the street this morning. He’s been dead for ages.

选项 A、mustn’t see
B、mustn’t have seen
C、couldn’t see
D、couldn’t have seen

答案D

解析情态动词题。must have done表示对过去情况肯定的推测，对过去情况否定的推测则用couldn’t havedone，所以选[D]。

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专业英语四级

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You______John in the street this morning. He’s been dead for ages.

专业英语四级

Don’tkeepusin______—didyougetthejobornot?

Sevenpeoplewerearrestedbecause

Whatistheauthor’smainpurposeinthepassage?

FirstAidFirstaidisthekindofmedicalcaregiventoavictimofanaccident/orsuddeninjurybeforetrainedmedialhe

ThethreebiggestliesinAmericanare:(1)"Thecheckisinthemail."(2)"OfcourseI’11respectyouinthemorning."(3)"I

Astronautsare______allkindsoftestsbeforetheyareactuallysentupinaspacecraft.

Peoplearelivingmuchlongerlivesthaneverbeforebutnotallenjoytheirgoldenyears.Forgetfulnessordementia,longaccep

Whenherealizedthepolicehadspottedhim,theman______theexitasquicklyaspossible.

Youmightthinkthatborrowingamatchuponthestreetisasimplething.Butanymanwhohasevertrieditwillassureyouthat

Despitemuchresearch,therearestillcertainelementsinthelifecircleoftheinsectthat______notfullyunderstood.

A．增加胶剂的硬度B．降低胶剂的黏度C．沉淀溶液中的泥沙D．收胶时利于气泡的逸散E．收胶时起消泡作用胶剂制备时，应用明胶的目的是()。

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