we all know is that destroying nature means destroying ourselves.A. whatB. WhichC. That D

问题补充：

we all know is that destroying nature means destroying ourselves.

A. what

B. Which

C. That

D. It

答案：

(答案→)A. what

B. Which

C. That

D. It

解析：考查主语从句。本题中的what we all know是一个主语从句，what引导起该从句，并在句中作为动词know的宾语。句意：我们都知道的事情是破坏大自然就意味着毁灭我们自己。It不能引导主语从句，that在主语从句不充当任何成分，which是指特定范围之内的某一个。故A正确。