问题
(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
B:couldn’t have failed
C:might have failed
D:shouldn’t have failed
正确答案是：
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