it was very cold my friend still went swimming this morning.A. Although;/B. Although; b

问题补充：

it was very cold, my friend still went swimming this morning.

A. Although;/

B. Although; but

C. But; although

D. /;although

答案：

(答案→)A. Although;/

B. Although; but

C. But; although

D. /;although

解析：句意：虽然很冷，但是我的朋友还在早上游泳。Altough虽然，尽管；but但是；这两个词不能同时出现在同一个句子中，故选A。