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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)。
插入语是插在句子中的一个词/短语或句子，用两个逗号隔开，与句子的其他成分没有语法关系，可以视为独立成分。通常是对一句话进行解释、补充。
A中的having amassed，因为有逻辑主语，所以既可以看成是伴随状语也可以看成是插入语，都是在修饰 Neuroscientists are drawing conclusion这个句子。伴随着积累知识，他们形成了结论。
D/E，按图形背景原理形成结论发生时间短于经过20年的积累知识，前者做主句更优。
现在分词做伴随状语起到伴随的动作和伴随的结果两种功能，如A就是伴随着积累知识的动作，形成了结论；E是他们积累知识，伴随的结果是形成了结论。
伴随的动作表示与主句动作同时发生，having则表示先时性；伴随的结果需要是主句动作的直接的、自然而然的结果。E积累知识并不会自然而然就形成结论，drawing conclusion用法不好。
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