句子改错SC-LIFK
出处: GMATPrep-2007E2-SC-75

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.
  • Ahaving, for example, been prescribed a drug at a dosage too low to be effective or having been

  • Bhaving, for example, a drug prescription that was ineffective because the dosage was too low, or being

  • Cas, for example, having too low of a dosage of a prescribed drug for it to be effective, or being

  • Dwhen they have, for example, been prescribed too low a drug dosage for it to be effective, or were

  • Efor example, when they have a drug prescription with a dosage too low to be effective, or been

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正确答案:A
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