couldn't have done和couldn't do的区别

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• couldn't have done 表示什么Jim!Did you have a good time at the party?Yes,but I really _____ have because I had a lot of work to do.A shouldn’t B couldn’t 注解说是对过去发生的事情的否定猜测用couldn’t have done ,我不明.明明不是参加了吗?不是用shouldn’t have done “本不该”