改错题

 If（A）you had come（B） to the party last night, you have known（C） the（D） fact.

【正确答案】

C

【答案解析】

应改为 would have known， 因为根据前半句的意思得知这是对过去事情的虚拟， 所以后半句的形式应改为 would have known.