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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：
正确答案B，我选的C选项，听以前的录音说which指代有歧义？不大明白~老师可不可以系统讲一下which在定从的指代~~
另：如果选B，没有体现出while前后语义的对称呀？通过语义我感觉是improve和introduce并列，所以选的C。难道该句是introduce与improve两个动词表示顺承关系？那while应该如何理解呢？希望老师指正~~
解答：
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