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时间状语从句由when，while，as，whenever，beforeafter，till，until，since，assoonas，themoment，immediately，nosooner…than，hardly/scarcely…when,every/eachtime,bythetime,nexttime等引导。Exercises1.Didyouremembertogivethemoneyyouowedher?Yes,Igaveittoher____Isawher.A.whileB.themomentC.suddenlyD.one2.Someonecalledmeupinthemiddleofthenight,buttheyhungup___Icouldanswerthephone.A.asB.sinceC.untilD.before3.I’mgoingtothepostoffice.___you’rethere.Canyougetmesomestamps?A.AsB.WhileC.BecauseD.If4.Hewaswalkingalongthesands____hesawabigfootprintinthesands.A.whileB.whenC.asD.whichBDBB5.Don’tgetoffthebusuntilit____.A.hasstoppedB.stoppedC.willstopD.shallstop6.Didyoucatchthefirstbusthismorning?No.Ithadleftthefirststop____Igotthere.A.assoonasB.atthetimeC.bythetimeD.duringthetime7.Thethiefstolemywallet____Iknewit.A.beforeB.untilC.whileD.after8.____hewenttotown,hewouldhavealookatthebookstores.A.WhenB.WhileC.WheneverD.AfterACAC9.____completed,thisrailwaywilljoinmanyindustrialcitiestoseaport.A.UntilB.WhileC.WhenD.After10.Iwasdoingmyhomework____someone____atthedoor.A.when,knockedB.as,wasknockingC.while,wasknockingD.but,knocked11.___thedayswenton,weathergotworse.A.WithB.SinceC.WhileD.As12.____youhavegotachance,youmightaswellmakefulluseofit.A.WhenB.sinceC.ThenD.ThereCADB13.You’dbettercomebackearlier____itisgettingcolder.A.asB.andC.butD.or14.Whynotbuyacheaperone,___youdon’thaveenoughmoney?A.sinceB.becauseC.forD.though15.____wehavefinishedthebookweshallstartdoingsomeexercises.A.FornowB.SincethatC.NowthatD.Sincenow16.Jackwasverytired____heplayedtennisallafternoon.A.ifB.assoonasC.becauseD.before17.Whywasthepriceofbreadsohighthatyear?____thewarbrokeout.A.AsB.SinceC.ForD.BecauseAACCD18.Hardly____theyleftthebuilding____abombexploded.A.did;thanB.had;whenC.had;thanD.did;whenB