— Dasan is from Canada he can speak Chinese very well.— I know he studies Chinese hard.A

问题补充：

— Dasan is from Canada, he can speak Chinese very well.

— I know he studies Chinese hard.

A. Although

B. And

C. So

D. But

答案：

(答案→)A. Although

B. And

C. So

D. But

解析：考查情景交际。“尽管大山来自加拿大，但他会说流利的汉语。”“我知道他学习汉语很努力。”根据句意可知，表示的是让步。故选A。