单选题If the south had won

问题补充：

单选题Ifthesouthhadwonthewar,whatisnowtheUnitedStates_____dividedintoseveralcountries.A.will beB.might have beenC.should beD.must have been

答案：

D解析虚拟语气，与过去事实相反用过去完成时态。