关于英语定语从句的几个选择题

关于英语定语从句的几个选择题 It's London（） Ye Shiwen got worldly recognized for her excellent performance in the swimming pools.A where B that C in which D whic Traveling,especially traveling abroad,has become a fashion,（）is common even in the western area in China.A that B it C as D in which Yao Ming announced his retirement on July 20 of 2011()he will never forget in his life.A when B on which C for which D that 选哪个 为什么