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对PREP1-97 指代问题
19. 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
答案是B , 但B 中的they 到底是指代industrialization and modem methods of insect control 还是 chemical pollutants ???
有前辈讨论过这个问题,但最后不了了之。
再次跪求神牛从天而降解答 GMAT 癖好的指代问题。 |
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