If I hadn't gone around the world when I was young, I would never have done it.

• A. I didn't go around the world when I had the chance and now I never will.
• B. I went around the world but I wish I had waited until later.
• C. I had the chance of a lifetime to go around the world and I took it.
• D. When I was young. I went around the world, but now I regret it.