扫描二维码，直接登录
题库 / Prep2007E1-SC-130
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.
while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
while at the same time introducing some 100,000 dangerous chemical pollutants that have
while they have introduced some 100,000 dangerous chemical pollutants at the same time, and have
but introducing some 100,000 dangerous chemical pollutants at the same time that have
but at the same time introduce some 100,000 dangerous chemical pollutants, having
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
老师，请问：
1. ", doing ..." 这样的形式做非谓语，应该修饰主语（题目中的"methods"），而不是就近修饰（题目中的"pollutants"），是吗？
2. "while...introducing" 这个从句中，因为从句主语与主句主语一致（都是"methods"），所以省略了，对吗？那么be动词为什么也可以省略呢？
谢谢老师！
1. 不是修饰。doing短语做伴随状语，它的逻辑主语是它修饰的句子的主语。
2. 我咋觉得这个问题和第一个问题一样呢。
谢谢老师！我现在知道啦！
1小问，如果是伴随/定语的话逻辑主语是谁那就是做谁的伴随/定语状语。
2小问是关于伴随状语的。因为状语主语与主句主语一致，表示主动，所以写成introducing；出题者为了注明伴随状语与主句的关系，又加上了连词while。一点问题都没有！变回原来的样子是while methods introduce chemical pollutants.
果然是之前问题问得不好……>
登录 或 注册 后可以参加讨论