It is essential that people______enough vitamins every day.

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问题 It is essential that people______enough vitamins every day.

选项 A、have
B、had
C、must have
D、will have

答案A

解析本题考查虚拟语气的用法。这是虚拟语气的特殊用法。it is+essential等形容词后由that引导的主语从句中需要使用虚拟语气，动词形式为(should)+动词原形，should通常可以省略。这类形容词还包括necessary,important，essential，imperative，urgent，preferable，vital，advisable等。所以选项A为正确答案。

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本试题收录于：英语题库普高专升本分类

英语

普高专升本

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It is essential that people______enough vitamins every day.

英语

普高专升本

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Theprofessorneedsanassistantthathecan______totakecareofproblemsinhisabsence.

Iappreciate______thatletterforme.

Itwasnotuntilhehadarrivedhome______herememberedhisappointmentwiththelawyer.

Itis(certainty)______thathewillcometomorrow.

Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehaviorsareformed.Itisnoteasytoexplainwhyoneperson

TheythinkthatyouwillgotoBeiHaiLibrarytomorrow,______?

Somethingextraordinaryhappenedinthathospital.Aman,whowasdeclaredclinicallydead,suddenly______.

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溃疡性结肠炎的病变部位主要是

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