prep1-97关于which和that的引导

97.   (29753-!-item-!-188;#058&003991)

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

各位，怎么判定这里改选限定还是非限定定语从句呢？

prep说：使用which作非限定定语从句,导致逻辑错误,
     表明所有的chemical pollutants都 have gone

virtually unregulated

难道是不是吗？谢谢大家罗～～

virtually unregulated

难道是不是吗？谢谢大家罗～～

不是 用which表明地球上只有十万种左右的化学污染物, 他们具有定语从举描述性质

原文意思是 这十万种有定语从句描述性质的化学污染物 (是全球所有化学污染物的一个子集)

谢谢你~不过，我以为：用which是表示这十万种的污染物都gone virtually unregulated

而that表示这十万种污染物中有gone virtually unregulated描述的那部分

你觉得呢？

你的理解有误

我们来举个例子  all pigs that are fat           意思是所有fat的pig （也就是不包括不fat的pig）

                           all pigs，which are fat     意思是所有pigs， 他们都fat （所有的pig都包括在内了）

这就是限制性和非限制性的概念的区别