填空题 Have you ever wished you {{U}}would travel{{/U}} back in time and offer up some {{U}}hard-earned{{/U}} wisdom to your younger self? Or how about {{U}}travel{{/U}} years into the future to check up and give yourself a swift kick in the pants if you've ventured too far {{U}}off{{/U}} path? A. would travel B. hard-earned C. travel D. off