应该选D：（习惯了 把废物、污水、废弃物排到河里）
这里只能选D,因为：
A：文法错误,起码要写 needs
B:is used to 后面得用 现在分词、动名词,不可以用动词原型
C：used to 后面得用 动词原型,不可以用 分词.
D：从文法和意思上来说是对的,is used to - 习惯了这样做.(那家工厂习惯了把污染物排进河里,但是现在它采取了新的做法来处理污染）后面应该加分词、动名词.所以是对的.
The factory its waste into the river ,but now it deals with
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