Having been used for many years,__ of the road is broken.1 part 2 a part 3 parts 为什么要选1而不选2 ,

Question

Having been used for many years,__ of the road is broken.
1 part
2 a part
3 parts
为什么要选1而不选2 ,

Answer 1

part of 就是个固定的搭配,指事物中的某个部分,但没有具体指哪一个.part of something is some of it.
比如,he lost part of his foot in the accident.
这个句子意思是,这条路用了很多年,有些地方都坏了.
另外,road当然是可数名词.