what do you think ___ we should do with the poullted water

题目

what do you think ___ we should do with the poullted water
that how which /

答案

选择/
不要被题干中的do you think 所迷惑,它只是一个插入语,把它抽出去并不影响结构.
所以变成what should we do with the polluted water?