分词作定语 疑惑 求助

Aviva0307

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,




本题选A，2008 prep语法笔记上说“ing分词的完成时态不能充当名词的定语,必须转化为定语从句n.+ having done ”
那么，本题中having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood（分词的完成时态），不是Neuroscientists的定语吗？

gwang5

这根本就不是个定语从句啊。

Aviva0307

这根本就不是个定语从句啊。

-- by 会员 gwang5 (2010/12/29 11:00:23)

不是定语从句，那这是个什么结构，能帮忙吗分析一下吗？谢谢呵~~~

angelcity

弱问，having……这个算是插入语么?