GWD-6-Q17:

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

网上SC讨论汇总:

A is the best

B，现在完成时不对

C，现在完成时不对，led to被分开，表目的应用to serve，而不用for serving

D，there be表达笨重，serving修饰对象不清

E，there be表达笨重，表目的应用to serve，而不用for serving

我选了B, 分析下来认为是因为B的between 1876 and 1904修饰了systems, 而本应该修饰 construction,所以错;

但网上分析是时态错? 我认为并没有错啊, have done.  请指教 难道from 18xx...to 19xx....决定了这道要用过去式?

between 1876 and 1904表达的是过去时间所以使用过去式

并且原文句意使用between 1876 and 1904修饰construction

在不得变更原文句意原则下,B相对犯的错很严重..

还是新手..仅供参考^^

thanks

any other explaination?