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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)。
Comma+participle" can modify the subject of the previous main clause. This sort of modifier should actually satisfy TWO requirements:
1) it should apply most nearly to the subject of the preceding clause (as you've said); and, even more importantly,
2) it should have one of the following RELATIONSHIPS to that clause:
* immediate consequence
* simultaneous, but lower-priority, action
here, this modifier doesn't have either of these 2 relationships to the main clause, so it's used inappropriately.
when we say "immediate consequence, we mean a consequence that is proximate, immediate, and produced as an essentially unavoidable result of the main action. for instance:
the bullet entered Smith's brain, killing him instantly --> this is an immediate and automatic consequence; if the bullet does this, then smith will be killed.
John scored 90 on the most recent test, raising his overall average by two points --> again, an immediate and automatic consequence; if john gets this score, there will automatically be the stated consequence for his average.
in the problem at hand, drawing new conclusions is not an automatic and essentially unavoidable consequence of amassing the knowledge in question; the researchers must actively go beyond just amassing the knowledge to draw those conclusions.
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