I think __silly __you not to forgive others for their mistakes.A it for B it's of C that's of D it's for但是第一个空为什么不是it?

I think __silly __you not to forgive others for their mistakes.A it for B it's of C that's of D it's for但是第一个空为什么不是it?
I think __silly __you not to forgive others for their mistakes.
A it for B it's of C that's of D it's for
但是第一个空为什么不是it?

I think __silly __you not to forgive others for their mistakes.A it for B it's of C that's of D it's for但是第一个空为什么不是it?
这是一个宾语从句,I think 是主句,剩下的做think的从句,从句也是一个完整的句如果用it就少了动词,所以要用it's,有了is就是一个完整句子了

it's silly 它（指代of后面的内容）是（is） 愚蠢的

silly是形容词，it 是代词，中间要加个助动词。再者，it's +形容词+ of +某人，是固定用法，是谁谁怎样做很怎样的意思。

B