【虚拟语气could/should/would/might+havedone用法的差别?1.It'sagreatpitythatyou_____havedonesuchathing.A.oughttoB.shouldC.couldD.might2.AsIhavenothingtodonow,I_____aswellgowithyou.A.shouldB.wouldC.couldD.might3._】

　　虚拟语气could/should/would/might+havedone用法的差别?

　　1.It'sagreatpitythatyou_____havedonesuchathing.

　　A.oughttoB.shouldC.couldD.might

　　2.AsIhavenothingtodonow,I_____aswellgowithyou.

　　A.shouldB.wouldC.couldD.might

　　3._______hecouldlate,givehimthemessage.

　　A.ShouldB.WouldC.HadD.Did