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To help preserve ancient Egyptian monuments threatened by high water tables, a Swedish engineering firm has proposed installing pumps, perhaps solar powered, to lower the underground water level and dig trenches around the bases of the stone walls.
(A) to lower the underground water level and dig trenches
(B) to lower the underground water level and to dig trenches
(C) to lower the underground water level and digging trenches
(D) that lower the underground water level and that trenches be dug
(E) that lower the underground water level and trench digging
"..swedish firm has proposed installing pumps." ..to do what? if you use 'that' then you have to split "..installing pumps.." from "..trenches..."
consider .. 'swedish firm proposed installing pumps that lower the underground water level and digging trenches.....' this seems like pumps will lower the water level and will help digging trenches... doesn't make sense
furthermore, digging trenches is parallel to installing pumps.
http://blog.ryandumlao.com/wp-content/uploads/2016/05/IMG_20130807_232118.jpg The GMAT is the biggest point of worry for most aspiring applicants, and with good reason. It’s another standardized test when most of us...