________, many problems of space flight could not be solved now.

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问题 ________, many problems of space flight could not be solved now.

选项 A、If electronic computers would not have been invented
B、Had electronic computers not invented
C、Had electronic computers not been invented
D、If electronic computers were not invented

答案C

解析此句为混合型虚拟语气结构，从句表示与过去事实相反，主句是表示与现在事实相反。省去if，虚拟条件状语从句用倒装形式。故C正确。

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专业英语四级

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________, many problems of space flight could not be solved now.

专业英语四级

Here’sacommonscenariothatanynumberofentrepreneursfacetoday:you’retheCEOofasmallbusinessandthoughyou’remakin

Decadesofscientificresearchshowthatstressandanxietyareprevalentproblemsatwork,contributingtodeficitsinemployee

Thehorseandcarriageisthingofthepast,butloveandmarriageisstillwithusandstillcloselyinterrelated.MostAmerica

Whendopeopledecidewhetherornottheywanttobecomefriends?Duringtheirfirstfourminutestogether,accordingtoabook

SowhyisGooglesuddenlysointerestedinrobots?That’sthequestioneveryone’saskingafteritemergedthismonththatthein

SowhyisGooglesuddenlysointerestedinrobots?That’sthequestioneveryone’saskingafteritemergedthismonththatthein

WhichofthefollowingistrueaboutfathersinSweden?

Mostpeoplewhoarecolor-blindactuallycandistinguishseveralcolors.Some,however,haveatruly____viewofaworldallin

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血浆可测得的阳离子与阴离子浓度间的差距为_________，其正常值为_________。

用聚酰胺柱色谱分离下列黄酮类化合物，乙醇一水进行洗脱，出柱的顺序为

某企业月初原材料借方余额为20万元，材料成本差异借方余额为0．2万元，当月入库材料计划成本为60万元，材料成本差异为节约1．8万元，当月领用材料计划成本为45万元，结存的实际成本为()万元

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血浆可测得的阳离子与阴离子浓度间的差距为_，其正常值为_。