Prep1-97，看答案有疑问

chuRiver · 发表于 2010-3-16 19:51:55

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

其中
B while at the same time introducing
E but at the same time introducing
while与but都是表转折的连接词，答案里说E的but..introduing与前面的have improved不能构成并列。为什么B没有这个问题？

hughlv · 发表于 2010-3-17 15:19:09

看了半天才反应过来是个SC题。。。

but表示强烈的转折关系，后面通常跟随一个完整的句子。while则更多表达的是一种伴随的关系。E的最主要问题是在后面的那个having了，发现这个问题就可以直接排除E选项。

chuRiver · 发表于 2010-3-18 10:02:54

额，，，原文没编辑好，不好意思
原来是while可以表伴随的缘故，谢谢了

Prep1-97，看答案有疑问

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