GWD5-17

georgeqian

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

我选B,但答案是A,why?

主要考虑的是between 1876 and 1904 插在the construction of three separate sewer systems 不好

michellemove

偶也支持B

jessie1981

我也赞同B。the construction 和three separate sewer systems 的关系强于和between 1876 and 1904 ，所以应该把the construction 和three separate sewer systems紧紧联系在一起。另外，整句话感觉在强调一种结果，用完成时比较好。

Jarod

Past tense is required in the sentence above, and "to serve" cannot be separated from the central word it modifies. Thus, A fits best!

luoye1

没有明显理由可以改变原句的时态，我是这么想的.