It is years of hard work___has made him what he is today.这里填that,为什么不能填which?

问题描述:

It is years of hard work___has made him what he is today.
这里填that,为什么不能填which?

是强调句式
It is/was ...that...

强调句型:it is (was) ...... that ............. 句型的要求。

这是个强调句.用It is.that 结构,不是定语从句