prep－SC求问

1、   Some patients who do not respond to therapies for depressing 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 right answer

E for example, when they have a drug description with a dosage too low to be effective, or been

根据以前的语法知识，having可以引导伴随状语吗，平时作GMAT，一看到having，being就立刻排除的。