(江苏省南通市2009期末调研)－Mary, how did your Math test go?
－I had thought I , but in fact I came in the top 10% in my class.
A. should have failed
B. couldn’t have failed
C. might have failed
D. shouldn’t have failed
网友回答
A. should have failed
B. couldn’t have failed
C. might have failed
(答案→)D. shouldn’t have failed
解析：考察情态动词的用法。Might have done表示对过去发生的事情的猜测或担心，意思是“或许是……而事实上不一定如此”。