Is this the recorder you want to have repaired?句

问题描述:

Is this the recorder you want to have repaired?句
Is this the recorder you want to have repaired?
句中为什么用了 have done 而不用动词原形?

不是用的have done,这两个词碰巧连在一起了.原为have it done,知道了吧?!那it去哪了,原句是没有it的。哈哈,it被that代替了,而且that在recorder后面并被省略了。哦,董了,谢啦