时态专题单选题1.一MrBlacklooksveryexcited.一Yes,90percentofthestudentsalreadycometohisbirthdayparty.A.have;seventiethB.have;seventiesC.has;seventiesD.has;seventieth2.—He’sneverbeenlateforschool.—________________.A.SohaveIB.SoamIC.NeitherhaveID.NoramI3.MyparentsagoodexampleformesinceIwasyoung.Theyteachmetobeagoodchild.A.wereB.havebeenC.willbeD.are4.—Look!YourteacherMissWhiteisoverthere.—No,itcan'tbeher.She________toBeijing.A.hasgoneB.hasbeenC.goD.willgo5.Thestudents______theclassroom,soit’stidyandcleannow.A.CleanB.havecleanedC.willcleanD.cleans6.–Look!Someone_____theclassroom.-Well,itwasn’tme,Ididn’tdoit.A.iscleaningB.wascleaningC.hasclean...