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,
我觉得确实像你所说的～
但是我不明白的是，现在完成时可以用来做定语还是什么的吗？
不是这一规则是不可以的吗？
疑问...
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前半句句子结构不完整
C. Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are前半句句子结构不完整
D. Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,now drawing solid 在后面是修饰Neuroscientists 呢，还是adulthood，指代离的太远
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,
BC, and are 没有平行对象
E，over the past twenty years，位置改变，改变原意，原意是积累了过去20年的关于brain 等的丰富知识，E是说在过去20年积累了丰富的知识，所以错
A和D，A中的having amassed这种用法现在可以了吗？
不可以的话就只剩下D了，虽然像楼上说的，now drawing solid 在后面是修饰Neuroscientists 呢，还是adulthood，但是从逻辑上看，只能修饰Neuroscientists 吧？
我选D
另外，麻烦楼上的GG，你再帮我看看http://forum.chasedream.com/dispbbs.asp?boardid=23&id=295538&star=1#3323961吧，谢谢啦！
prep2-75. (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
A. 正确。
刚看到songlovegt引用这个题说明having问题，这样的话又回到A了，跟A比起来，D改变了句子中心了。
大家觉着呢？
fightbear：
谢谢呀，完全明白，豁然开朗
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