单项选择:1.Theydidn'tstarttowork_____thebossarrived.A.soB.assoonasC.whileD.until
2.Wemustsetoffnow,______we'llmissthelasttrain.
A.andB.whileC.thenD.or
3.Canyounamethreecountries_________Chineseisusedasoneoftheirlanguages?
A.thatB.whichC.whereD.there
4.Thereisnoair________wateronthemoon.
A.andB.orC.yetD.so
5._______shefinishesreadingthebook,shewillgiveittoyou.
A.WhenB.WhileC.BeforeD.Until
6.Thelightswentout_______thevwerereading.
A.whileB.beforeC.afterD.if
7.Haveyoubeenhere________?
A.ateightthedaybeforeyesterday
B.sinceoneyearago
C.twoyearsago
D.sincetwoyears
8.EverynightLiLeistudiedhardanddidhishomework_____11:30pro.
A.atB.sinceC.untilD.for