It's important___the piano well.A.of him to play b.for him to piay c.of him playingd.for him playing

It's important___the piano well.A.of him to play b.for him to piay c.of him playingd.for him playing
It's important___the piano well.A.of him to play b.for him to piay c.of him playing
d.for him playing

It's important___the piano well.A.of him to play b.for him to piay c.of him playingd.for him playing
b.for him to play
不定式作主语
主语：to play the piano well
这里为了使句子前后平衡用了形式主语it代替之
for him表示动作play的发出者
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d

B

for him to play

B
it is adj of you 一般可以说you are adj---这里肯定不能说you are important