How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?

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问题 How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?

选项 A、when
B、since
C、before
D、until

答案C

解析 before常可用于将来时态，表示“才；就”，如：It will be several weeksbefore you are used to the new life in college．几个星期后你就会适应大学里的新生活了。A．when一般不与将来时态连用。B．since常与现在完成时连用。D．until直到，用在此处意义不符。

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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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How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?

英语

普高专升本

WhenwefacedifficultiesinourEnglishlearning,wewillnever______.

Likemostpeople,Iwasbroughtuptolookuponlifeasaprocessofgetting.ItwasnotuntilinmylatethirtiesthatImadet

AHappyFamilyandaLongLifeWhenJapan’sKamatoHongodiedattheageof116,shewastheworld’soldestwoman.ButMrs.

Yourhairneeds______.You’dbetterhaveitdonetomorrow.

（非英语专业做）Therewasatimewhenparentswhowantedaneducationalpresentfortheirchildrenwouldbuyatypewriter,aglobe

Inordertolearnaforeignlanguagewell,itisnecessarytoovercomethefearofmakingmistakes.Iftheprimarygoaloflangu

Whensheheardfromthehospitalthathergrandfatherhaddied,she______intotears.

Self-confidencegivesushope.Itisaservantwhogivesitsmasterlightwhenheisinthedark.Anditisencouragementwhena

(2006)He’scarelesswithmoney;______,hehasafinancialembarrassment.

Ineed______morevolunteerstohelpmovethepiano.

副脾的CT表现是

不属于头痛问诊重点的是

走私、贩卖、运输、制造海洛因或者甲基苯丙胺十克以上不满五十克或者其他毒品数量较大，处

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ViennaViennawasoneofthemusiccentersofEuropeduringtheclassicalperiod,andHaydn,Mozart,andBeethovenwereall