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trainspotting
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A. an event in past can not have a present participle describing it.
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tashu
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IMHO B
Reason
1. I do not like "between 1876 and 1904 " in between construction...of phrase.
2. Concerns still have effect in present so present perfect is also fine.
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Hussain15
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trainspotting
Concerns about public health led to the construction between 1876 and 1904 of three
separate sewer systems to serve
metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of
three separate sewer systems to serve
B. Concerns about public health have led to the construction of three separate sewer
systems between 1876 and 1904 to serve
C. Concerns about public health have led between 1876 and 1904 to the construction
of three separate sewer systems for serving
D. There were concerns about public health leading to the construction between 1876
and 1904 of three separate sewer systems serving
E. There were concerns leading between 1876 and 1904 to the construction of three
separate sewer systems for serving

Wheter its A or B, I have a query.

Why the seperators are not used in any of the option? Like if I use the seperator in A, it will become
Concerns about public health led to the construction, between 1876 and 1904, of three separate sewer systems to serve

Waiting for a kind explaination :)
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trainspotting
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Sorry for the late reply friends...The OA is A...I marked it as B while attempting...Realized that due to the modifier error, B is wrong....



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