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Industrialization and modern methods ofinsect control have improved the standard of living around the globe whileat the same time they have introduced some 100,000 dangerous chemicalpollutants, having gone virtually unregulated since they weredeveloped 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
这题做的时候觉得没有靠谱的选项，勉强选了A ,
A,having有问题
B,introducing 有问题，就算和主句一致而省略主谓，也应该是（have） introduced 吧？
C, at the same time的位置和which指代有问题
D,E introducing和主句谓语无法并列
请各位指点，谢过了~~
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发表于 2015-9-24 21:07:50
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