对aeoluseros斑竹对having done 解释的疑问

问题源自新PREP sc1 188

188.
   (26379-!-item-!-188;#058&001961)

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

A. Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are

B. Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

C. Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

D. Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, 答案：A

E. Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,

aeoluseros斑竹对A项用having done作定语的解释是，having done不能引导限制性定语从句的而可以引导非限制性定语从句。但是请看旧PREP  SC1 97题：

97.   (29753-!-item-!-188;#058&003991)

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) 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, which have

(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have   答案：B

(E) but at the same time introducing some 100,000 dangerous chemical pollutants, having

问题：

1.对于A项，语法笔记上十分明确地说现在分词的完成时态不能作修饰语并没有考虑是否是限定性的问题，而且这里的having····也可以理解为是非限制性定语从句啊，为什么这里就不行呢？

2.就是语法笔记上说A项的having gone有作状语的歧义存在，我没有看出这里怎么能做状语，请讲解

3.怎样判断having结构在句中是作定语还是状语，像188题我觉得having···无论作定语还是状语都能够理解的通，有没有什么诀窍？

我想了一下，新PREP sc1 188题里的having结构不是作定语，而是状语，用having是因为amass这个动作在前,are now drawing 这个动作在后，不知道是不是这样啊。

顶

请NN帮忙，这道题真的很困惑。特别是我的第三个问题。

顶

怎么总是没人理呢，版主大人请现身帮忙，谢谢。