PREP 19 or 130 ？？

这个题目有两个版本：

19. 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

130.
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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, and have

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

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

红色为差异点。

在19中，选择B我没意见。答案是B

但是130中，答案也是B。但是我看不出C有什么大问题，大家说说C有什么不对吗？

130中they都是指代同一个东西吧，“工业化和现代杀虫方法”。难道是分析语意？

130的C有几个问题：

1、while常跟doing，算是个习惯搭配吧；

2、两个they指代对象不一致：前一个指代是LZ所说，后一个指代pollutants；

3、and have的并列对象是have introduced，改变了原文的意思（原文的having gone...也是分词后置定语用来修饰pollutants的）。

一家之言。

1、while常跟doing，算是个习惯搭配吧；

谢谢