【正确答案】 D

【答案解析】shouldn’t have done sth．意为“本来不应该做某事反而做了”，说明过去的动作，含有责备之意。Since he was very busy yesterday，you shouldn’t have asked him for help．他昨天很忙，你不该去找他帮忙。故D为正确答案。A和C应用于现在时，而B更强调本身的意愿，例如：With all this work on hand，you mustn’t(oughtn’t to)go to the cinema．手头有这么多工作要做，你不许(不应)去看电影。I have told him several times，but hewouldn’t listen．我告诉他好几次了，可他就是不听。