一道逻辑题！关于分词的用法！

gzzxl

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

我看有人说D,E发现drawing修饰主句主语Neuroscientists即表示状态同步进行。显然科学家不能在积累知识过程中同步且随时作结论。

不是说分词可以表示结果么？那么直接用分词表示如今的结果为什么不行？

wjtwenzi

楼主注意那个now就是表示现在，划线没有划到now，因此可以认为这个drawing是正在发生的事。
这道题选A