he is old the old man still insists on studying at a night school.A. If B. AlthoughC. W

问题补充：

he is old, the old man still insists on studying at a night school.

A. If

B. Although

C. When

D. Because

答案：

A. If

(答案→)B. Although

C. When

D. Because

解析：考查连词。If 如果，Although 虽然，When 当什么的时候，Because 因为，句意：虽然他年纪大了，但是这位老人仍然坚持在夜校学习。所以选B。