---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 failedB.couldn’t have failedC.might have failedD.mustn’t have failed
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C解析句意：我本以为我可能会失败。Might have done表示对过去的一种推测；A项意为“本应该做而实际未做”；B项意为“不可能”；D项表示禁止。