大全 335

1.                            
Humans have been damaging the
environment for centuries by overcutting trees and farming too intensively, and
though some protective measures, like the establishment of national forests
and wildlife sanctuaries, having been taken decades ago, great increases in
population and in the intensity of industrialization are causing a
worldwide ecological crisis.

(A) though some
protective measures, like the establishment of national forests and wildlife sanctuaries,
having been taken decades ago, great increases in population

(B) though some
protective measures, such as the establishment of national forests and wildlife
sanctuaries, were taken decades ago, great increases in population

(C) though some
protective measures, such as establishing national forests and wildlife
sanctuaries, having been taken decades ago, great population increases

(D) with some
protective measures, like establishing national forests and wildlife
sanctuaries that were taken decades ago, great increases in population（B）

(E) with some
protective measures, such as the establishment of national forests and wildlife
sanctuaries, having been taken decades ago, great population increases

Not very difficult to get th e right answer. But what's the structure of this sentence.

TONY, 偶觉得用establishment比较好, (the act of starting an organization, relationship, or system)
例子:

establishment of
the establishment of NATO in 1949

而动名词偶觉得一般在没有相应名词的时候用. 这个请大牛指点!

though some protective measures, like the establishment of national forests

这里之所以用establishment 好，我认为是由于前后的比较，如果前面是一个action的话，后面用establishing较好,而前面是名词，尽管such as 是举例，可能没有like的比较来得要求严谨。