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, as, for example, having too low of a dosage of a prescribed drug for it to be effective, or being taken off a drug too soon.