Our factory is much more productive now This years production is five times ( ) it was ten years ag

问题描述:

Our factory is much more productive now This years production is five times ( ) it was ten years ag
此题为什么填what ,as为什么不可以,如果一定要用as,因对句子作怎样的改变.
在这里as与what具体有哪些区别?

as---as--倍数表达法中倍数放在第一个as之前,同时第一个as后跟adj/adv的原形