标题: GWD23 Q21 [打印本页] 作者: chenyao16887 时间: 2012-5-7 21:53 标题: GWD23 Q21 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 pollutant, having 这道题答案是B，但是A哪里错呢？？？很困惑地说。。。作者: peill 时间: 2012-5-7 22:31
我还以为选C呢。B怎么是While引导的分词短语呢？作者: 泠泠曲罢 时间: 2012-5-8 00:42
A 最后部分的having修饰they-->就是指Industrialization and modern methods。。如果这样的话我们应该用GMAT的经典形式 have, have, and have作者: chenyao16887 时间: 2012-5-8 09:31
那为什么不能理解为having....是结果状语，修饰前边的一系列？？作者: lijiazhou 时间: 2012-5-8 10:48