求gwd-13-15一题

hebbechou

那个高人可以给我解释一下这道题哪。我选了d,答案是A

GWD-8-Q16: GWD-13-15

Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.

 

 

1. Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve

2. Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve

3. Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving

4. There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving

5. There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving

多谢~~

hebbechou

wuwu, who can help me with this? is it so easy that nobody woule like to explain?

zhangpeiyu01

D) There were concerns about public health leading to the construction

D is wrong b/c it is the concerns but not the health to lead to the construction.