—he is very old he works very hard. — Wow great. I should learn from him.A. AlthoughB. H

问题补充：

—he is very old, he works very hard.

— Wow, great. I should learn from him.

A. Although

B. However

C. Because

D. So

答案：

(答案→)A. Although

B. However

C. Because

D. So

解析：句意：尽管他很老了，但他工作非常努力。A尽管B然而C因为D因此。根据句意，应选A。