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求一道prep语法题

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楼主
发表于 2010-10-14 23:17:41 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
Practice test 2
75. 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.
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

正确答案是A,我有个疑问,having been done不是不能作为状语修饰句子吗?在其它题里用来排除选项的方法在这里又不适用了……
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沙发
发表于 2010-10-15 12:42:13 | 只看该作者
这里应该不是修饰句子,这里是举例的内容,实际上是名词形式,一些病人接受了不合适的治疗,比如,处方剂量小以至于无效或过早的被停止用药

这些都是不适合的治疗的内容
板凳
发表于 2011-5-17 14:04:45 | 只看该作者
having been done应该是修饰主语patients的,动名词作用像OG12th第一题一样。
问下楼主,having been done在哪里看到说不能作状语修饰句子的,虽然我也感觉是这样,但是没有evidence...
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