Scientists ______that bacteria through microscopes for many years．

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问题 Scientists ______that bacteria through microscopes for many years．

选项 A、studied
B、have studied
C、had studied
D、have seen studied

答案B

解析本题考查时态的用法。由于句中已有“for many years”，故应用现在完成时。

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本试题收录于：英语题库成考专升本分类

英语

成考专升本

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Scientists ______that bacteria through microscopes for many years．

英语

成考专升本

Accordingtothepassage,theauthorthinksofeachinterviewas______.Whenhuntingajob,you’dbettercommunicatewithpeop

HerparentsgiveCindyeverythingsheasksfor,andasaresult,she’svery______.

Forthispart,youareallowed30minutestowriteacompositiononthetopic:TheFirstLettertoa’PenPal’.Youshouldwrite

Ishouldn’tletitbotherme.Itreallydoesn’tmatteranyway.Butitdoesbotherme!Allthosepeoplearepreparingtocelebrat

（请务必）yougetintouchwiththefactorybeforeyougothereonbusiness.

Thispassageismainlyabout.Itissuggestedthatifyouhaveanyproblems,.

Mr.Smithissupposedto______forLondontheweekbeforelast.

Theuniversityhaslaunchedaresearchcentertodevelopnewwaysof______bacteriawhichhavebecomeresistanttodrugtreatme

Theauthorquestionswhether,inAmerica,the"pursuitofhappiness"______.Insaying"Manisnowhappybydefinition"(Para.

Theauthorquestionswhether,inAmerica,the"pursuitofhappiness"______.Theauthorbelievesthatman’s"pursuitofhappine

与延髓相连的脑神经包括、、和。

男性，21岁，查体时发现心尖部舒张期隆隆样杂音，左房增大。该患者最可能的诊断是

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英语

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Forthispart,youareallowed30minutestowriteacompositiononthetopic:TheFirstLettertoa’PenPal’.Youshouldwrite

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Thispassageismainlyabout______.Itissuggestedthatifyouhaveanyproblems,______.

Mr.Smithissupposedto______forLondontheweekbeforelast.

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与延髓相连的脑神经包括______、______、______和______。

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与延髓相连的脑神经包括、、和。