标题: OG12 P.694 SC 21 [打印本页] 作者: 176568418 时间: 2010-9-5 19:13 标题: OG12 P.694 SC 21 21. 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. A)
B) Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over past twenty years, and are
C) Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
D) Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,
E) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,
21. 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.
有个小trick 这题划线部分后面是一个now drawing，由于分词ing形式主要是充当伴随结果状语和伴随动作状语，在题目中drawing引出这段话跟前面不存在伴随结果或者伴随动作的关系，因此可以确定此句的谓语为“are now drawing” 因此前面两个逗号直接都是可以省略的插入成分，句子主体为"Neuroscientists are now drawing"
于是判断 第一步：b和c中 and are 明显and多余 排除 第二步：D选项没有谓语 排除 第三部：e中有两个谓语“have amassed” 和“drawing” 排除 且已经改变了原句意思