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题库 / Prep2007E1-SC-130
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.
while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
while at the same time introducing some 100,000 dangerous chemical pollutants that have
while they have introduced some 100,000 dangerous chemical pollutants at the same time, and have
but introducing some 100,000 dangerous chemical pollutants at the same time that have
but at the same time introduce some 100,000 dangerous chemical pollutants, having
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having修饰主句主语 Industrialization and modern methods，逻辑语义错误，排除
选项C (Industrialization and modern methods have improved the standard of living around the globe) ,and( have gone virtually unregulated since they were developed more than 50 years ago.)and前后不平行，前面是完整句子，后面不是；
选项D （ have improved） the standard of living around the globe but（ introducing） 括号内不平行
选项E have done 和do不平行；having修饰错误
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