改错题 46.If you Ahad studied the problem carefully Byesterday, you Cwon' t have any difficulty Dnow.
【正确答案】 C
【答案解析】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。