Question

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

d.for him playing

Answer 1

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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Answer 2

B

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

Answer 3

for him to play

Answer 4

B

Answer 5

d