problem

chenyuwg

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
which is the answer?

chenyuwg

thanks

joywzy

你说得对！

这道题我老做错，已经错几次了！真不应该。

Louisa_xy

我认为是C
dig 应该和 install 平行：proposed installing....and digging
to lower the underground water level 是install pumps的目的，而dig dig trenches around the bases of the stone walls 不能是 install pumps的目的，水泵不能挖壕沟。

joywzy

the ans:B