这句中The report shows (that) we are making some progress but that we need to make great effort.
问题描述：
这句中The report shows (that) we are making some progress but that we need to make great effort.
为什么其中第一个that可省而第二个不可省呢?
答
在由and或or,but所连接的两个宾语从句时,第一个从句中的that可以省；而第二个从句中的that不能省.
It is depressing to think (that) life is purposeless and that evolution has no higher destination.