关于现在分词v+ing在句尾用逗号隔开

86274619hua

为什么这里说时态不对不能当状语，只能把v+ing当定语，感觉可以表伴随啊，遵循时态一致写成having drawn 的形式可以吗？
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,
答案是A。 OG对D项的解释: The final descriptor in present tense,now drawing
conclusions....does not fit the opening clause, which is in present-prefect
tense(have amassed a wealth)and seems to modify adulthood.

86274619hua

求解