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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)。
①A项中的having amassed，having done如果看作做定语或是adverb modifier是没有歧义，是可以使用的。有歧义的不能用（Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.#修饰have introduced还是修饰pollutant有歧义#）
②and要判断两个分句是不是结构完整。B,C的结构不完整
③V-ing可以作状语也可以作定语，所以有歧义的可能。D,E处可能在修饰adulthood。此外，作为伴随状语，传达的是结果的意思，但是amass knowledge和drawing conclusions没有这样的必然结果的逻辑关系，D，E错误。
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