---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 failedB.couldn’t have failedC.might have failedD.shouldn’t have failed
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D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”。