It’s important ________ the piano well.
A．of him to playB．for him to play
C．of him playingD．for him playing
B
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.有關(guān),這個(gè)adj.是用來形容sb.的,表示某人這么做真是太adj.了。
It is +adj.+for sb.+to do sth表示做某事對(duì)某人來說很adj.，這里的adj.是do sth.的屬性，里面的sb.跟adj.沒有直接聯(lián)系。
該句是說鋼琴彈得好重要，而不是他這個(gè)人重要，故介詞用for而不用of.
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