大虾来看个题吧

szxissean

GWD-8-Q16: GWD-13-15

Concerns about public health led to the constructionbetween 1876 and 1904 of three separate sewer systems to servemetropolitan Boston.

A.    Concernsabout public health led to the construction between 1876 and 1904 of threeseparate sewer systems to serve

B.    Concernsabout public health have led to the construction of three separate sewersystems between 1876 and 1904 to serve

C.    Concernsabout public health have led between 1876 and 1904 to the construction of threeseparate sewer systems for serving

D.    Therewere concerns about public health leading to the construction between 1876 and1904 of three separate sewer systems serving

E.     Therewere concerns leading between 1876 and 1904 to the construction of threeseparate sewer systems for serving

答案是a,我觉得是b啊。

SuperSteven

concerns about public health发生在过去，怎么可能用现在完成时

francoisyang

between 1876 and 1904未持续到现在，过去时。