—Aren’t you tired of practicing playing the piano day after day?— I enjoy every minute of

问题补充：

—Aren’t you tired of practicing playing the piano day after day?

—, I enjoy every minute of it.

A. On the other hand

B. On the contrary

C. Now and then

D. Once again

答案：

A. On the other hand

(答案→)B. On the contrary

C. Now and then

D. Once again

解析：On the other hand另一方面； On the contrary 相反； Now and then偶尔； Once again再一次。句意：--难道你不厌烦这样日复一日的练习弹琴吗？--恰好相反，我在享受弹琴的每一分钟。故选B。