Growing up Micheal Jordan was in his prime Beijing native Wu You knew what he wanted to

问题补充：

Growing up Micheal Jordan was in his prime, Beijing native Wu You knew what he wanted to do

A. since

B. when

C. until

D. before

答案：

A. since

(答案→)B. when

C. until

D. before

解析：句意：当乔丹在体育上的鼎盛时期时，地道的北京人吴悠正在慢慢地长大，他知道了他要做什么。since自从，既然；when当……时候；until到……为止；before

在……以前。根据句意故选B。