had done表示的意思是在过去的某一时间之前某事已经被做,此为过去完成时,had sth done,让某事被做。
过去完成时(had done)
①表示在过去的某个时间或动作以前已经完成的动作或已经存在的状态。就是我们常说的"过去的过去"。
Until then, his family hadn't heard from him for six months.
到那时为止,他家里已经有六个月没得到他的消息了。
②表示从过去的过去开始,持续到过去的动作或情况,并且有可能会继续延续下去。此时经常用延续性动词。
By the time I left the school, he had taught the class for 3 years.
到我毕业时,他已经教那个班三年了.
过去完成进行时:had been doing
表示从过去的过去开始,持续到过去的动作或情况,期间一直有规律的在进行、不曾间断,并且有可能会继续延续下去。此时经常用延续性动词。
e was an experienced parachutist who had done over 150 jumps.
他是个经验丰富的跳伞者,已经跳过150多次了。
I did not acknowledge that he had done anything wrong.
我没有承认他犯了什么错。
A period spent working abroad had done nothing to mellow him.
他在海外工作了一段时间,却没有变得老练。