154. (33193-!-item-!-188;#058&006626)
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,
(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
OA: A，but what about B?笔记上说“having a drug prescription与being taken off不对称”怎么不对称了？还有为什么要用HAVING BEEN被动语态哦？？？谢谢你们的回答，大家要加油！把语法提高提高再提高！ | 
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发表于 2011-5-16 19:50:08
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