—You ought to have made an apology to Tom yesterday evening．—Yes, I know I __ __．A.ought to haveB.have toC.shouldD.must have
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A解析考查情态动词。Should have done = ought to have done本应该做某事而实际上没有做。句意：昨天晚上你本应该向汤姆道歉的。是的，我知道我本应该向他道歉。所以选A，ought to have后省略了made an apology to him。