?Q21: PP55. ?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.A.while at the same time they have introduced some 100,000 dangerous chemical pollutants, having B.B.while at the same time introducing some 100,000 dangerous chemical pollutants that have C.C.while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have D.D.but introducing some 100,000 dangerous chemical pollutants at the same time that have E.E.but at the same time introducing some 100,000 dangerous chemical pollutant, havingE.but at the same time introducing some 100,000 dangerous chemical pollutant, having 我选的是C,答案是B,在论坛里没有这题的讨论,所以希望朋友们帮我解解这题,谢谢
这道题的C选项可不可以理解为是at the same time 的位置引起了歧义呢?如果是while at the same time introducing 的话,就是修饰introducing,意思是在improve 的同时introduce 了, 但如果是放在10000 dangerous pollutants 的后面,也可以理解为一次性同时引入了100000种的pollutants,这道题和TN24中的Q20很类似,这是我的一点拙见,望讨论。