GWD23的一道语法题求助！！！

violettaa

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


划线部分是while到having
求大神们帮忙解析一下~~~这题网上搜了些解析但看的都模模糊糊的不太懂

miarena

是选D吗？

violettaa

miarena 发表于 2015-3-21 23:41
是选D吗？

不对。。。是B。。。

xiuyiwei1

A选项里having作定语修饰pollutants, redundant and not clear，而且they的指代有不清，
B选项用while doing的结构承接了前主句表结果，且用了that定语从句修饰pollutants，没什么明显问题。
C选项，While表达的是于此同时的意思，但是却变成了they have introduced并列，感觉并非原意而且while + doing一般表示同时性，而且pollutant与which之前插入了at the same time, 导致修饰不清。
DE都用了but，强调了转折而非同时性，D中的pollutants at the same time that have也是有修饰问题，E也是pollutant, having blabla 这种非限定修饰GMAT不会写入正确里的

个人意见哈，

violettaa

xiuyiwei1 发表于 2015-3-22 11:26
A选项里having作定语修饰pollutants, redundant and not clear，而且they的指代有不清，
B选项用while doin ...

谢谢啊！！ 但是有一块不太懂
A最后的pollutant, having...为什么会显得redundant and not clear？我觉得修饰的挺清晰的啊..

2643301345

A 选项的having 修饰的是Industrialization and modern methods  。
所以错误。 要修饰pollutant才对

xxfsandra

同意6楼