题目选项分析

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

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.