问题补充：
I know a little bit about the city as I there for one year in my youth.
A. am studying
B. had studied
C. studied
D. have studied
答案：
A. am studying
B. had studied
(答案→)C. studied
D. have studied
解析：考查时态。句意：在我年轻的时候我在那学过一年所以对这个城市我知道一点。根据语境学习的动作在过去，所以用一般过去式，选C。
