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
原文意思：工业化的杀虫方法提高了人们的生活水平而于此同时这些方法也引入了一些化学污染物，这些化学污染物没有得到有效的管理。
题目分析：A的have gone动词发起者便车前面那个method了，发起者不对（为什么having gone的发起者是methods看看昨天写的那道题就明白了）。B用but indroducing与前面动词发起者保持一致并且后面用that have gone，that指那种化学污染物，都没有错误，保留。C那个they指方法，但是类似于英吉不仅杀人而且他防火了，这个they实无必要。D把at the same time放后面去了，语义逻辑不通顺（应该是这个方法提高了人们的生活水平于此同时引入了一些坏的东西，如果用D就变成了这个方法提高了人们的生活水平而引入了一些坏的东西于此同时，句子前后逻辑不舒服，干掉）E又用having gone，发起者不对，干掉！选B。
