答案：C

题目分析：考查时态，由后面的时间状语before the 2012 London Olympics，可以知道时态，所以选C，句子意思“孙阳，年轻的游泳天才，已经赢得2012论断奥运会以来一些金牌”

点评：考查时态要抓住时间，这题有明显的时间状语：before the 2012 London Olympics所以很简单，再就是结合上下文

即学即练：The inner connection for the entire area _____when there was a sudden power cut yesterday.

A. lost            B. was lost    C. had lost      D. had been lost

选B