问一道gwd

Chrislvzh · 发表于 2010-5-3 10:57:12

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

答案选b....求高人解释一下

luyiqing · 发表于 2010-5-3 20:33:58

while后可以直接加doing，A和E中having有作have introduced 的伴随的嫌疑，其实应该修饰pollutants。A和C中they和未划线部分they指代不一致。D中but加现在分词的用法是错的

Chrislvzh · 发表于 2010-5-3 22:24:47

牛人...谢啦

问一道gwd

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