改错题

If you had studied (A) the problem carefully yesterday (B), you won't have (C)  any difficulty now (D).

【正确答案】

C

【答案解析】

【译文】如果你昨天仔细地研究了该问题，你现在就不会有任何困难了。
本题考查虚拟语气。该句是个错综虚拟句，从句是对过去事实的虚拟，主句则是对现在的虚拟，一般用would+动词原形。改为wouldn't have,