it's very kind -you to get the tickets - the world cup

选【C】
it's very kind 【of】 you to get the tickets【to】 the world cup.
It's +形容词+0f/for sb.to do sth.是固定句型.
用of,表示人 怎么样.
用for 表示事情怎么样.
it 是形式主语,代替to do sth.真正主语是to get me three tickets to the world cup.
这个句子可以改写成：You are kind to get me three tickets to the world cup.
第二个to 是介词,是：向,往,到