we were studying abroad, we learned much about foreign culture and customs.
A. Since
B. While
C. After
D. During
网友回答
A. Since
(答案→)B. While
C. After
D. During
解析：考查连词：A. Since 自从，既然，B. While当…时候，虽然，C. After在…后面 D. During在…期间，句意：当我们在国外学习的时候，我们学到很多关于外国文化的事。选B。