Saut� the oil in a saucepan over medium heat. Saut� the onion, celery, and carrots until softened, 5 minutes. Add the garlic, and continue cooking for another minute. Stir in the broth, tomatoes, spinach, beans, and pasta. Boil, then reduce the heat, and simmer 10 minutes. Add the zucchini. Cover and cook 5 minutes.