It was very good __ him to help us A by B of C from D about

It was very good __ him to help us A by B of C from D about
It was very good __ him to help us A by B of C from D about

It was very good __ him to help us A by B of C from D about
答案 B
固定搭配 it's good of sb…… 某人很好,某人为人很好
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．
你会发现在这个句型中你把sb.和adj.提出来可以造个句sb.is(are) adj.
如It's very kind of you to help me.
把里面的sb.和adj.提出来可以发现you are kind是说得通的.
而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
如It's difficult for you to deal with the problem.
你就不能说you are difficult了吧
这就是怎么决定句子中的介词用of还是用for的方法