if-的虚拟语气倒装

if的虚拟条件句中，如果谓语动词含有were,should,had这几个词，可以把were,should,had放在if的位置，并去掉if：这就是虚拟条件句的倒装。但已经没有if了，如：1.Ifhehadcomeyesterday,hewouldhaveknownit.=Hadhecomeyesterday,hewouldhaveknownit.2.IfIwerethere,Iwouldhelpthem.=WereIthere,Iwouldhelpthem.3.IfIshouldhave200,000yuan,Iwouldbuyagoodcar.=ShouldIhave200,000yuan,Iwouldbuyagoodcar.1.________foryourhelp,we'dneverhavebeenabletogetoverthedifficulties.A.HaditnotB.HaditnotbeenC.IfitwerenotD.Ifwehadnotbeen2._________heretomorrow,hewouldshowushisnewpictures.A.WerehetocomeB.ShouldhecomeC.HadhecomeD.A&B请认真看完if的虚拟条件句倒装后，完成这两题选择题。明日讲解。