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题库 / Prep2008E1-SC-188
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.
Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are
Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,
Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,
题目分析：
本题的原句有点长，其实主干很简单，去掉长长的插入语having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood，主干为：
Neuroscientists are now drawing solid conclusions about how the human brain grows.
选项分析：
A选项：Correct. 本选项在语法和逻辑上均是正确的。
B选项：and是连词，需要连接两个句子。但在本选项中，and身前的句子没有谓语动词。
C选项：and身前的句子没有谓语动词错误同(B)。
D选项：划线部分身后的now drawing是伴随状语，本选项在语法上是没有错误的。但是，依据图形背景原则，相对于“下结论”来说，“积攒知识”的持续时间必然更长，其是“下结论”这个事件的背景。因此，draw应为主句，amass应为从句（伴随状语）。
E选项：本选项错误同(D)。
1] 此题C选项和正确答案比较，有限定和非限定修饰问题，按照句义，应该是限定修饰才对啊。当然-ing 失去了having done已经完成的意思。 但可以A把having前面的逗号去掉，变成限定修饰吗?
当然这样主谓之间插入太多内容，整体结构需要变化。
不可以去掉逗号，having done不做限制性定从去修饰。。
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