OG一道比较题，多谢

No less remarkable than the development of CD has been the use of the new tech to revitalize, in better sound than was ever before possible, some of the classic recoded performance of the Pre-LP era.  

不清楚 in better sound than was ever before possible, 到底是个什么结构。 was 为什么补足，为什么又省掉was的主语，possible在这里什么成分。

谢谢大家指导！

不好意思，用的OG的书本，不知道怎么跟汇总中的题号对起来。打搅了。。。

自己的帖子顶一个。。大家帮帮忙吧：）