Some patients who do not respond totherapies for depression may simply have received
inadequate treatment, having, forexample, been prescribed a drug at a dosage too low to be
effective or having been taken off a drugtoo soon.
(A) having, for example, been prescribeda drug at a dosage too low to be effective or having been
(B) having, for example, a drugprescription that was ineffective because the dosage was too low,
(C) as, for example, having too low of adosage of a prescribed drug for it to be effective, or being
(D) when they have, for example, beenprescribed too low a drug dosage to be effective, or were
(E) for example, when they have a drugprescription with a dosage too low to be effective, or been
两个having been的主语只能是patients，那么从两个having been只能作为伴随状语，而不可能作为定语（having done可以作为非限定性定语修饰名词，但这里不符合题意）。但是前面主句的谓语是完成时态，伴随状语不是不能修饰完成时态的谓语么，给出一个og上的例子。请大家指点。
Neuroscientists, having amassed a wealth of knowledge over the pasttwenty years about the brain and its development from birth to adulthood, are now drawing solidconclusions about how the human brain grows and how babies acquire language.
(A)Neuroscientists, having amassed a wealth of knowledge over the past twentyyears about the brain and its development from birth to adulthood, are
(B)Neuroscientists, having amassed a wealth of knowledge about the brain and itsdevelopment from birth to adulthood over the past twenty years, and are
(C)Neuroscientists amassing a wealth of knowledge about the brain and itsdevelopment from birth to adulthood over the past twenty years, and are
(D)Neuroscientists have amassed a wealth of knowledge over the past twenty yearsabout the brain and its development from birth to adulthood,
(E)Neuroscientists have amassed, over the past twenty years, a wealth of knowledgeabout the brain and its development from birth to adulthood,
正确答案为A
og对D选项的解释：The final descriptor in present tense ,now drawing conclusions....doesnot fit the opening clause, which is in present-prefecttense(have amassed a wealth)and seems to midify adulthood.
如果prep 1-154 的后面两个having done是伴随状语，那么是否可以理解为，主句谓语为完成时态时，后面作伴随状语的分词也用完成时态作为伴随状语就是成立的，而且是否是只能用完成时态呢。根据OG那道题对D选项的解释，发现关键的不是伴随状语不能修饰完成时态的谓语，而是present tense，这个时态上不合适。请大家指点。 | 
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发表于 2011-8-23 16:49:49
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