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[Sentence Correction]
试题详情
题目：
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.
选项:
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, and have
D、 but introducing some 100,000 dangerous chemical pollutants at the same time that have
E、 but at the same time introduce some 100,000 dangerous chemical pollutants, having
答案:
B
提问：
英老师，这题正确答案c里while后面怎么没有主语阿，while后面不是应该跟一个完整句吗。。还有，我觉得b里while前后一个是完整句，一个不是完整句，不能相对应吧。。
解答：
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