Take another look at the sentence:

Ironing a clean shirt, __________, and buying a pack of gum for fresh breath were the tasks Aaron completed before the first day of spring semester.

The blank requires a gerund phrase. You chose making sure that he had printed a course schedule, which is a gerund phrase but with a relative clause attached. You thus have a parallelism error.

Before you continue, review the rules for parallel structure.

Go back to the sentence to try again.

HomeTermsExercises MOOCHandoutsPresentationsVideosRulesAboutShopFeedback