[SC资料] SC的困惑

     25.  .Neuroscientists, having amassed awealth of knowledge over the past twenty years about the brain and itsdevelopment from birth to adulthood, are nowdrawing solid conclusions about how the human brain grows and how babiesacquire language.    A. Neuroscientists, having amassed awealth of knowledge over the past twenty years about the brain and itsdevelopment from birth to adulthood, are     B. Neuroscientists, having amassed awealth of knowledge about the brain and its development from birth to adulthoodover the past twenty years, and are    C. Neuroscientists amassing a wealth ofknowledge about the brain and its development from birth to adulthood over thepast twenty years, and are    D. Neuroscientists have amassed awealth of knowledge over the past twenty years about the brain and itsdevelopment from birth to adulthood,(   E. Neuroscientists have amassed, overthe past twenty years, a wealth of knowledge about the brain and itsdevelopment from birth to adulthood,
请问给位牛牛，为什么这题不选E呢？我觉得E选项，后面的now drawing ...... language,这一部分是ving 表示结果状语，意思是科学家在过去二十年累积的知识导致得出了一个结论。希望好心人能解答，本人很纠结啊。