同学你好，该知识点来自沪江网校《英语零基础直达大学四级【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好
needn't have done  是一个固定搭配，表示没有需要做某事，可是做了。
例子：
The airport is close to us. You needn't have hurried there early.机场离这儿很近，你没需要早早地赶到那里。(可是你早早地到那儿了)
He is still young. You needn't have sent him such an expensive present.他还小，你没需要送他这么昂贵的礼物。
　　注意：
　　如表示过去不必做也没有做之意，需用didn't need to do。
　　It is not cold today. I didn't need to take the thick sweaters out.今天天气不冷，我没有需要把厚毛衣拿出来。(实际上也没拿)

祝学习愉快哦