求解一题GWD-TN23-Q21 P55

dreamroad

?Q21: PP55.
?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.A.while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B.B.while at the same time introducing some 100,000 dangerous chemical pollutants that have
C.C.while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D.D.but introducing some 100,000 dangerous chemical pollutants at the same time that have
E.E.but at the same time introducing some 100,000 dangerous chemical pollutant, havingE.but at the same time introducing some 100,000 dangerous chemical pollutant, having
我选的是C，答案是B，在论坛里没有这题的讨论，所以希望朋友们帮我解解这题，谢谢

zanyingsan

c里面的which指代有问题。

dreamroad

gone virtually unregulated 的逻辑主语是什么呢

dreamroad

which不就是指chemical pollutants吗？

wzb5618

同2楼，which就近指代time

dreamroad

楼上都是牛人啊！明白了

pipilovelail

这是PREP旧版1里面的97题，楼主自己去看prep笔记吧，which本来就是一个很矛盾的问题，在which的就近指代问题上，OG里面很多都是自相矛盾的，所以我觉得which的问题是一个相对性问题而不是绝对性的语法错误，不能仅仅因为which就排除C。况且which在这里是因为他的泛指错了，而不是因为他的就近指代错了。

zanyingsan

which这里是想指代前面整个句子，这样是错的。不是就近指代time的问题，抱歉我没说清楚。

dreamroad

谢谢楼上二位又有收获了

越看越觉得那个熊猫图像好好玩

sunnylbs

have gone virtually unregulated 是什么意思呢? 这道题我也不明白。而且，A错在哪里的呢？还有，根据答案看来while在这里并不表明前后语句的并列，那while什么时候是平行结构的标志，什么时候不是呢（比如说这道题，while前后两句的时态并不是并列的）？