请教tt gwd-5-17

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

答案是A,我认为是B,请大家给出思路

between 1876 and 1904 说明是一个过去的动作，过去的过去发生（1876），但已经在过去结束了（1904）。已经结束和现在没有关系了，所以，是用一般过去时态。

，

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

 Answer:  B

 这道题我也选得是B，我的思路是这样的首先根据there be后的结构一般为很简洁的结构，此处现排除DE,之后我们可以看出between是修饰construction的那么C就被排除了，剩下AB我的问题就来了，我认为这个时间段是修饰这个construction 的那么就好像楼上说的那样根据过去时可排除B那我想知道这个题中的led to 和后面的那个to serve ...这之间到底是个什么关系啊

同意二楼　

时态没有明显理由要改变

led to construction to serve 表示目的吧

...

还有一点想补充：between1876and1904 的位置 紧贴construction修饰建设 这种语感比放在sewer system修饰污水管系统 强

望指正

我也选B了 觉得the comstruction of  three separate sewer systems 放在一起意思更紧凑~~~