The following sentence may have an error in effective writing. the sentence or part of the sentence is underlined. choose the best revision of the underlined part. if no revision is necessary, choose the first answer.. some of the musicians left their music scores at your desk. a. left their music scores at your desk.. b. left there music scores at your desk.. c. left his or her music scores at you're desk.. d. left they're music scores at your desk..