Mary______my letter; otherwise she would have replied before now.

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问题 Mary______my letter; otherwise she would have replied before now.

选项 A、has received
B、ought to have received
C、couldn’t have received
D、shouldn’t have received

答案C

解析空白处的意思应该是玛丽可能没收到信，所以选[C]couldn’t have received，表示对过去行为的否定推测。在情态动词的推测性用法中must只用于肯定句中．can/could不能用于肯定句中。couldn’t have+过去分词正好与must have+过去分词的意思相反，后者表示对过去行为的肯定推测。

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专业英语四级

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Mary______my letter; otherwise she would have replied before now.

专业英语四级

Fatcannotchangeintomuscle______changesintofat.

Whatarethetwospeakersmainlydiscussing?

WhichofthefollowingisINCORRECTaboutthewoman?

Whatistherelationshipbetweenthetwospeakers?

Therenewableenergyindustryhasdismissedas"trumped-upnonsense"anattackbyDonaldTrumponScottishwindenergyprojects.

WhichofthefollowingstatementsisINCORRECT?Whatdoesthelastexampleshow?

Thehealthyadolescentboyorgirllikestodotherealthingsinlife,todothethingsthatmatter.Hewouldratherbeaplumb

Accordingtothenews,whathashappenedlastautumn?

Whowillbeexpulsed?

Whowillbeexpulsed?

未经有关部门批准，医师擅自开办诊所，卫生行政部门可采取的措施不包括()。

关于报复陷害罪的说法，下列哪些选项是正确的?()

海洋主管部门应当自收到海洋工程环境影响报告书之日起()个工作日内，作出是否核准的决定，书面通知建设单位。

在我国，全国人民代表大会统一行使国家权力，实行民主集中制原则。下列选项中，体现人民代表大会制度组织和活动基本原则的是()。

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