题目

-Why does Jenny look so upset? -Soyou if your best friend misunderstood you. A. do B. would     C. did     D. will 答案：B。考查虚拟语气和倒装。由答语中的if your best friend misunderstood you可知, 与现在的事实相反, 主句用“would +动词原形”, so在句首用倒装, would后面的动词省略。故选B。一个三位数的个位上数字是a，十位上数字是b，百位上的数字是c，把该三位数个位数字、百位数字对调位置，则对调后的三位数与原三位数的差为_____．