填空题 Woodchoppers and the Iron Horse had not {{U}}thus{{/U}} greatly damaged the beauty of its {{U}}setting{{/U}}. A boy could go to the pond and {{U}}lie on his back{{/U}} against the seat of a boat, lazily drifting from shore to shore while the loons dived and the swallows dipped {{U}}around{{/U}} him. A. thus B. setting C. lie on his back D. around