Whether ways will be found to stop pullution or not is just worries the public.A. whyB.

问题补充：

Whether ways will be found to stop pullution or not is just worries the public.

A. why

B. which

C. that

D. what

答案：

A. why

B. which

C. that

(答案→)D. what

解析：D 考察表语从句。句意：是否能够找到阻止污染的方法是公众所担心的，what引导一个表语从句，同时在表语从句中做主语。