It’s important the piano well. A. of him to playB. for him to playC. of him playingD. for

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：It is + adj.+ for/of sb.+ to do sth是固定句型.

It is+adj.+of sb. +to do sth中的adj.跟sb.有关,这个adj.是用来形容sb.的,表示某人这么做真是太adj.了。

It is +adj.+for sb.+to do sth表示做某事对某人来说很adj.，这里的adj.是do sth.的属性，里面的sb.跟adj.没有直接联系。

该句是说钢琴弹得好重要，而不是他这个人重要，故介词用for而不用of.

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