牛人来看一道PREP语法 急

zlljolie

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

(A) while at the same time they have introduced some 100,000 dangerous chemical pollutants, having

(B) while at the same time introducing some 100,000 dangerous chemical pollutants that have

(C) while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have

(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have

(E) but at the same time introducing some 100,000 dangerous chemical pollutants, having

这题正确选项B。为什么C不对呢？一直觉得B中while(they are) introducing也不对啊。。。

牛人解答

小伊YSY

while doing 的用法是正确的。比如og12SC中134题：
Recently implemented “shift-work equations” based
on studies of the human sleep cycle have reduced
sickness, sleeping on the job, and fatigue among shift workers while raising
production efficiency in
various industries.


我个人觉得未划线部分中的they指代对象和C中的they指代不一样。
欢迎拍砖

luoweijia0511

C那个Which修饰time的话不对吧、、

frederickson

C的话应该是WHICH的指代不清晰吧.....