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标题: help!! a problem from prep! [打印本页]

作者: gurongqian    时间: 2007-1-4 06:28
标题: help!! a problem from prep!

Some patients who do not respond to the 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 effectivve or having been
    

b. having, for example, a drug prescription that was ineffectve because the dosage was too low, or being

c. as, for example, having too low of a dosage of a presdribed 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 exanple, when they have a drug prescription with a dosage too low to be effective, or been

the answer is a.

can anybody tell me why?


作者: mbz    时间: 2007-1-4 06:44

Some patients may have received, having been ...,or having been...

"having been" here is to emphasize and modify what the patients did.

This is a perfect structure.






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