关于OG17 719题

Arvin_Peng

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) 原句

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,


答案是A。但是 having done不是不能直接作定语的吗？ 有没有人给解释一下。 谢啦！

Arvin_Peng

想通了。。作状语。 那这种句中插入短语，怎么短时间判断成分呢。 有什么可以分享的诀窍吗