问题标题：
1.Theycan'tleaveuntilthey__theirwork.A.didB.aredoingC.havedoneD.hasdone2.I__heresinceImovedhere.A.willworkB.workedC.workD.havebeendoing3.__sixyearssinceIbeganstudingEnglish.AtheyhavebeenB.ItisC.ItwasD.Thereare4.-How
问题描述：
1.Theycan'tleaveuntilthey__theirwork.
A.did
B.aredoing
C.havedone
D.hasdone
2.I__heresinceImovedhere.
A.willwork
B.worked
C.work
D.havebeendoing
3.__sixyearssinceIbeganstudingEnglish.
Atheyhavebeen
B.Itis
C.Itwas
D.Thereare
4.-Howlonghaven'tweseeneachother?
-Well,it__nearlytwoyearssincewe__last.
A.is/havemet
B.was/hadmet
C.is/met
D.hasbeen/hadmet
5.Don'tgetoffthebusuntilit__.
A.stop
B.willstop
C.stopped
D.hasstopped
6.Whenhe__allthenewspapers,hewillgohome.
A.sells
B.hassold
C.willhavesold
D.willbesold
陈娜回答：
1、C.时间状语,主将从现.
2、D.since表示完成时态,故用现在完成进行时态.
3、B.完成时态的句型.Itis+时间+since+一般过去时态.
4、C.同上.
5、D.同第一题.
6、B.同第一题.
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