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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：
首先杀DE 剩下A、B、C
B 我觉得introducing和while前面的半句句子不平行，而且当时做题时理解成unregulated的是industrialization and modern methods，所以就没选。
A和C的差别是at the same time放的位置，还有having和which
have，觉得having更简洁明确的指明发起者是methods，所以就选择了A。
解答：
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