OG SC 21 老掉牙一题还有不明白的地方～～～真心求助

小涵在追梦 · 发表于 2011-12-1 08:06:08

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) 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
老掉牙的一道og题被讨论若干次其他选项都明白了我就是不懂A 是怎么回事这个having done的结构不是做定语的修饰主语的么，having done 不是不能这么用的么只能用在伴随状语还要有完成时态的语义～～～好困扰啊大家帮看看呀
另外这个下滑线怎么弄实在是不会吖

小涵在追梦 · 发表于 2011-12-1 11:04:15

dddd

gui59106375 · 发表于 2011-12-1 14:28:19

3) having done可以做非限定性修饰，不能做限定性修饰。
夸克的语法大全里面明确写出having done做限定性修饰是错误的：
The perfective aspect cannot usually be expressed in the finite clause:
wrong: The man having won the race is my brother.
correct: The man who has won the race is my brother.
也就是说.完成时的ing分词形式(having done)作为限制性的修饰是不可以的，但是可以作为非限制性的修饰。
4) having done短语中所表达的内容发生在主句动作之前

小涵在追梦 · 发表于 2011-12-1 17:17:39

谢谢楼上同学今天搜了好多帖子关于having done能不能作定语的～～～终于解决啦呵呵

小涵在追梦 · 发表于 2011-12-1 17:24:54

2.Some patients who do not respond to therapies for depression may simply have received inadequate treatment,having, for example, been prescribed a drug at a dosage too low to be effective or having been taken off a drug too soon.
帮我看看这个呗我没弄明白这个例句应该是inadequate treatment的例子 having done这时候充当名词成分啦？还有这种用法？

12604698 · 发表于 2011-12-9 19:31:18

2.Some patients who do not respond to therapies for depression may simply have received inadequate treatment,having, for example, been prescribed a drug at a dosage too low to be effective or having been taken off a drug too soon.
帮我看看这个呗我没弄明白这个例句应该是inadequate treatment的例子 having done这时候充当名词成分啦？还有这种用法？

-- by 会员小涵在追梦 (2011/12/1 17:24:54)

哇，找到个好例子。
http://forum.chasedream.com/GMAT_SC/thread-622222-1-1.html
这个贴子有人发帖讨论：完成时，ing。能不能作状语。
我正纳闷呢。好例子~

不知道这个算什么状语，“补充状语？”“从属状语？”。。。 for example 后面把谓语have received 展开了，用相应时态的分词。
原来规矩真不是死的

OG SC 21 老掉牙一题还有不明白的地方～～～真心求助

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