What polluted the air and the water in this area?为什么不用加助动词?what did you say?这里为什么要加？What did pollute the air and the water in this area?为什么不这样？
问题描述：
What polluted the air and the water in this area?
为什么不用加助动词?
what did you say?这里为什么要加？
What did pollute the air and the water in this area?为什么不这样？
答
这个polluted不就是助动词吗，主谓宾都不差，就是一个完整的句子啊！！
答
What是此句中的主语