[求助] verbal review 2016

William_kerry

Around 1900, fisherman in the Chesapeake Bay area landed more than seventeen million pounds of shad in a single year, but by 1920, overfishing and the proliferation of milldams and culverts that have blocked shad migrations up their spawning streams had reduced landings to less than four million pounds.
A  that have blocked shad migrations up their spawning streams had reduced landings to less

B  that blocked shad from migrating up their spawning streams had reduced landings to less
C  that blocked shad from migrating up their spawning streams reduced landings to a lower amount
D  having blocked shad from migrating up their spawning streams reduced landings to less
E  having blocked shad migrations up their spawning streams had reduced landing to an amount lower


楼主求各位大神分析 各选项

alzn2765

A. have blocked时态错
C. amount与pounds不能比
D. having blocked不能做限定性修饰
E. amount与pounds不能比