tomchengs

不用分词结构，句子应该是
Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, and they are now drawing solid conclusions about how the human brain grows and how babies acquire language.
能够采用分词结构，第一点一定要主语相同，第二点是谓语间的逻辑关系，本题明显第一个谓语动词是第二个的原因状语，所以第一个用分词结构。
如果第二个用分词结构，则第二个谓语是第一个谓语的结果状语，显然，不符合他们的逻辑关系