3、coveredB.havebeenuncoveringC.areuncoveringD.haveuncovered(2006陕西卷)5.—Youlookverytired____atalllastnight?—No,notreally.I’mtiredoutnow.A.DoyousleepB.Wereyousleeping C.DidyousleepD.Hadyouslept(2006陕西卷)6.Theconstructionofthetwonewrailwaylines__________bynow.A.hascompletedB.havecompleted C.