向各位一英语老师们请教几个单选题：1.Youmustsweepthefloor(atonce)换掉该词A.ontimeB.immediatelyC.sometimes2.Thisroomistwice()thatoneA.biggerB.asbiggerasC.asbigas3.Nothingbutgrassandtrees()thehillA.cove

　　向各位一英语老师们请教几个单选题：

　　1.Youmustsweepthefloor(atonce)换掉该词

　　A.ontimeB.immediatelyC.sometimes

　　2.Thisroomistwice()thatone

　　A.biggerB.asbiggerasC.asbigas

　　3.Nothingbutgrassandtrees()thehill

　　A.coverB.coversC.covering

　　4.—Hehasn'tfinishedwritinghiscompositionyet

　　—()

　　A.SohaveIB.NeitherdoIC.NorhaveI

　　能有拓展的知识更好,我不想只停留在一个题上,不然我的分数永远也提不起来,