问题补充：
It’s important the piano well.
A. of him to play
B. for him to play
C. of him playing
D. for him playing
答案：
A. of him to play
(答案→)B. for him to play
C. of him playing
D. for him playing
解析：句意：对他来说把钢琴谈好很重要。It’s +adj +for sb + to do sth.对于某人来说做某事是……样的。
