15. Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.
Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve
Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve
Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving
There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving(A)
There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving
1、除了between 1876 and 1904要用过去时,a、b比较,b还有哪儿的错误?
2、时间副词“between 1876 and 1904”放在of、to之前,有何区别?即:led to the construction∨of three separate sewer systems和led to the construction of three separate sewer systems∨to serve.