Question

---Mary, how did your Math test go?

---I had thought I _________, but in fact I came in the top 10% in my class.

1. A.
   should have failed
2. B.
   couldn’t have failed
3. C.
   might have failed
4. D.
   shouldn’t have failed

Answer 1

D
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”。