题目选项分析

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.

Some patients who do not respond to therapies for depression may simply have received inadequate treatment, when they have, for example, been prescribed too low a drug dosage to be effective, or were taken off a drug too soon.