问几道英语选择踢Don'tgetoffthebusuntilit.A.stopB.willstopC.stoppedD.hasstoppedWhenheallthenewspapers,hewillgohome.A.sellsB.hassoldC.willhavesoldD.willbesoldTheycan'tleaveuntiltheytheirwork.A.didB.aredoingC.hav

Question

问几道英语选择踢
Don't get off the bus until it__.
A.stop
B.will stop
C.stopped
D.has stopped
When he__all the newspapers,he will go home.
A.sells
B.has sold
C.will have sold
D.will be sold
They can't leave until they__their work.
A.did
B.are doing
C.have done
D.has done
原因

Answer 1

第一题选D 从句主语为it,而A用了原形,应该用单三形式stops,故A错误；根据“主将从现”原则得知B错误；C时态错误；D用现在完成时强调“直到公交车已经停下来”,“until it has stopped”.
第二题选A,根据“主将从现”原则.
第三题选C,A时态错误,如果选B“直到他们正在做他们的工作,他们才能离开.”显然句意不通；而选C“直到他们做完他们的工作,他们才能离开.”用have done完成形式强调动作的完成; D项主谓不一致.