求教！OG13 SC25 ！跟大家提问的关注点不一样啊，求解惑。

sashafreja

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


正确答案选A。
但是我真的疑惑 Neuroscientists,...,are now drawing solid conclusions 这个时态的用法。
现在进行时不是表现在正在进行的动作吗，draw a conclusion 不是瞬间的动作吗，那么能一直在得出结论吗？
还请大家不吝赐教，谢谢啦~

guoyilin2015

别纠结时态了，RON说过时态对non-native speaker非常困难，而且也不是最关键的split
不如一眼望去，BCDE句子全不完整。。

guoyilin2015

哦不对，D是完整，但是drawing conclusions既不是amass knowledge的直接结果，也不能伴随amass knowledge。。

sashafreja

guoyilin2015 发表于 2015-9-19 11:10
别纠结时态了，RON说过时态对non-native speaker非常困难，而且也不是最关键的split
不如一眼望去，BCDE句 ...

谢谢~其他的地方都懂 只是我纠结时态啊。