PREP注解中说“过去完成时的分词结构在GMAT中是错误结构。having been done不能作为后置定语修饰先行词,应改为其对应的定从that have/have been done”,可154偏偏又选A,请高手指点下!谢谢
154.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 to be effective, or were (E) for example, when they have a drug prescription with a dosage too low to be effective, or been
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