Question

画出作定语修饰名词的分词短语

The river polluted by the chemicals from the factory has been a cause of disease in this city．

Answer 1

答案：
解析：

本句的主干是The river has been a cause of disease in this city．这条河已经成为这个城市疾病发生的一个原因。polluted by the chemicals from the factory是用来修饰the river，指明是哪一条河，由于pollute和river之间是被动关系，因此用的是过去分词短语。