-John,how did your English exam go?
-I thought I_____,but in fact I came in the top 10% in the class.
A.should have failed B.couldn't have failed
C.might have failed D.mustn't have failed
答案选C,为何不选A
分析题目
分析解释一下四个选项
解释一下全句的意思
谢谢~