[原创]求解prep语法新题一道prep1-188

188.
            (26379-!-item-!-188;#058&001961)

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. Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are

B. Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the 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,

答案是A，我选的是E，不是说having+done结构不能作定语吗？

E肯定是不对的，它改变了原句的含义，句子的重心。

句子的结构是:

Neuroscientists, （插入语修饰主语）are now drawing solid conclusions about A & B。

但E却改变成：

Neuroscientists have amassed a wealth of knowledge about A & B，now drawing......

没有：having+done结构不能作定语 这样的定论。

having done这里是做定语.

我认为having done作定语主要是会产生时间上的歧义：having done的东西是延续着、持久着(现在分词短语做定语的内在含义之一)，还是已经完结。over the past twenty years时间状语的存在让这重歧义不存在，表明了已经完结，所以是可以这么用的.

open to discuss.

open to discuss.

open to discuss.

open to discuss.

open to discuss.

修正一下观点：

非限制性的having done是可以用的，但是限制性的不能用.

为什么非限制性的having done是可以用的，但是限制性的不能用呢？

还想请问一下版主over the past twenty years的位置是否合理呢？

E. Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,
    

谢谢

prep188

A正确

B 除开插入部分，句子变为
        Neuroscientists and are ….结构错误

C 句子主干是
        Neuroscientists and are …结构错误

D now drawing
        改变句子重心,主干部分变成了修饰部分。原句强调的是Neuroscientists are now drawing.

E now drawing
        改变句子重心,主干部分变成了修饰部分。原句强调的是Neuroscientists are now drawing.

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. Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are首先要读懂句意
        科学家先要amassed很多的knowledge才能够draw solid conclusions这里用having用的很好体现出了动作的先后
        从逻辑意思上就可以判断出来
        然后要注意看到状语
        看到代词要小心

B. Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are状语位置的改变产生歧义
        原先是having amassed a wealth of knowledge over the past twenty years这里的over the past twenty years是与现在完成时连用的
        然而B选项改成its development from birth to adulthood over the past twenty years以为是大脑的发展从出生到成人这20多年的历史 and多余

C. Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are状语位置的改变引起歧义 and多余
        去掉的have不能体现动作的先后

D. Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,改变句子重心
            

E. Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,改变句子重心