标题: 请教 [打印本页] 作者: scholar 时间: 2010-7-24 22:53 标题: 请教 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 为什们D不可选 答案是B作者: yueqianchen 时间: 2010-7-25 10:56
我想问下A为啥不对
D不对是因为at the same time地方不对，在后面看齐爱说的是introducing dangerous chemicalpollutants和gone virtually unregulated同时的作者: 夏日飘雪 时间: 2010-7-25 11:39
A不对，是因为having gone会有歧义，有可能做定语修饰前面的一个名词，就是先行词，也有可能做状语伴随。。