本贴相关题目 GMATPrep-2007E1-SC-97 | TN-23-SC-21 (OCTR)

00:00:00

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.

Awhile at the same time they have introduced some 100,000 dangerous chemical pollutants, having
Bwhile at the same time introducing some 100,000 dangerous chemical pollutants that have
Cwhile they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
Dbut introducing some 100,000 dangerous chemical pollutants at the same time that have
Ebut at the same time introducing some 100,000 dangerous chemical pollutants, having

正确答案: B

请教prep07 -97题

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scarlett006

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发表于 2012-5-7 22:18:49 | 只看该作者回帖奖励

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97. (29753-!-item-!-188;#058&003991)

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
我觉得B选项也不好啊，WHILE和AT THE SAME TIME有重复的含义
求教CDer！！