恩 没有总结出现成的题供大家参考 只是想问下这两个的用法
因为在PREP破解版中有说过 having been done不能做为定语修饰 一般要改成that have been done 所以基本上是错误的
而having done好像没对过？？是不是这样呢？？
大家有没有相关的题目可以提供讲解一下~马上上战场了啊 心慌慌。。。
谢谢谢谢！！
做限制性定语的确没有，但做疑似的非限制定语prep320里有...做状语也有。
啊 这位好心的同学 又是您啊。。谢谢
你说的这个是having been done结构的吧？？ 那having done呢？？
能不能再详细一点？叩谢。。
我说的是having done....看这个例子。
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,
选A... 你可以把having理解成 adverbial participle clause也可以理解成那个， post-attributive participle clause
having been 的例子看着题：
75. (28533-!-item-!-188;#058&003994)
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.
(A) having, for example, been prescribed a drug at a dosage too low to be effective or having been
(B) having, for example, a drug prescription that was ineffective because the dosage was too low, or being
(C) as, for example, having too low of a dosage of a prescribed drug for it to be effective, or being
(D) when they have, for example, been prescribed too low a drug dosage for it to be effective, or were
(E) for example, when they have a drug prescription with a dosage too low to be effective, or been
选A，这里放句末做 adverbial participle clause
o 好的 我明白le 就是说限制性修饰的时候一般是不可以的 但是非限制的情况下两个都可以做后置状语是吗？
那还有一个小问题 在第一个例子中的D 选项之所以不对是因为改变了句子的重心 还是因为drawing会造成修饰歧义呢？
having done在非限制性 的情况是做 状语还是 定语不好说，第一个例子里就很模糊。
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你的第一个问题，我也不能解释，D的话，over the past 20 years的位置不好，其他没看出什么错，你可以看看这个帖子。
http://bbs.taisha.org/thread-1193922-1-2.html
超级牛人也无法给解释。。。。
哦好的，总之不能因为这个就一下排除就对了。。
恩 句子重心的问题。。我就说作者到底想说什么我咋知道，以前问也没人理我。。
谢谢你哦~ 你考过了还在这里解答问题啊？真好人~
重心一说，过于玄幻了。
其实就是逻辑表达的合理性，修辞漂不漂亮，表达是否符合习惯而已。
很多人不看语法错误和表达习惯，动不动就重心有点吃不消。
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