[SC悬赏令] 走过的大神，不要错过。渣渣由OG的发散

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.

• ANeuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are  分析A选项
• BNeuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are  分析B选项
• CNeuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are  分析C选项
• DNeuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,  分析D选项
• ENeuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,  分析E选项我想问的其实就是：  A do B，doing 这种形式，doing 是伴随状语的情况下，在doing前面加副词now 修饰doing这种形式可以吗。