I ran in pain and decided not to_____ in track next year.

观全文，作者受伤决定下年再不参加“比赛”了，故选 A，后面的"in track" 也是个提示。如果是B句子就有问题了。

参考文在此：“Ready --- set---” The gun popped and we were off. The other girls rushed agead of me. I felt ashamed as I fell farther and farther behind.
“Hooray!” shouted the crowd. It was the loudest cheer I had ever heard at a meet. The first-place runner was two laps（圈）ahead of me when she crossed the finish line.
“Maybe I should drop out,” I thought as I moved on. However, I decided to keep going. During the last two laps, I ran in pain and decided not to race in track next year. It wouldn’t be worth it, even if my foot did heal.
，选自英语四级考试！