we were studying abroad we learned much about foreign culture and customs.A. SinceB. Whi

问题补充：

we were studying abroad, we learned much about foreign culture and customs.

A. Since

B. While

C. After

D. During

答案：

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。