paeagain wrote:
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.
The last modifier ("having gone virtually unregulated since..") needs to modify the pollutants. With that in mind, let's jump into some of the choices.
(A) while at the same time they have introduced
...
The last modifier ("having gone virtually unregulated since..") needs to modify the pollutants. With that in mind, let's jump into some of the choices.
(A) while at the same time they have introduced
...
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