Li Fang is very busy she’s always helping others with their lessons.A. butB. althoughC. s

问题补充：

Li Fang is very busy，she’s always helping others with their lessons.

A. but

B. although

C. so

D. for

答案：

(答案→)A. but

B. although

C. so

D. for

解析：根据题意应用连词but表示转折。