I doubt_____they can swim across the river.

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问题 I doubt_____they can swim across the river.

选项 A、why
B、that
C、whether
D、when

答案C

解析在肯定句中，及物动词doubt后的宾语从句，多用whether或if引导，表示“怀疑是否，怀疑能否”。

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专业英语四级

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I doubt_____they can swim across the river.

专业英语四级

Indoctorssaythatforlackofexerciseofour,wearegrowingoldsooner.

Britainisfacinga【C1】riseinitsratpopulation【C2】growingnumbersofpeopleleavefastfoodscrapsinthes

Theopportunity______inaprestigiouscorporationisadreamforthegraduatesnowadaysinmanycountries.

Theyoungpeoplearebecomingincreasinglyfilm______.

Earlyinthefilm"ABeautifulMind,"themathematicianJohnNashisseensittinginaPrincetoncourt-yard,hunchedoverapla

Mobilephone,e-mailandtelephone______ofpeople’ssocialcommunicationnowadays.

Moreandmoreresidences,businesses,andevengovernmentagenciesareusingtelephoneansweringmachinestotakemessagesorgi

Smoking,asitisprovedinthewholeworld,maybeapleasureforsomepeople.【C1】______,allthescientistshavepointedout

Smoking,asitisprovedinthewholeworld,maybeapleasureforsomepeople.【C1】______,allthescientistshavepointedout

ManycountrieswillnotallowcigaretteadvertisingintheirnewspaperoronTV—especially【C1】______theadvertisementsareusu

进入阴毛中，环绕阴器，上达小腹的经脉是

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对发明的创造性的要求是同申请日以前已有的技术相比()

智齿是人的第三大臼齿，用于切割食物。现代人的食物比古人的软，也更容易咀嚼，颚部因此变小，智齿往往长不出来。有科学家认为，智齿将随着时间的推移而最终消失。这一现象蕴含的哲学道理是

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