一道高中语法填空,急等

题目

一道高中语法填空,急等
it was very kind of you __(invite) me for dinner
为什么要用to invite ,表主动不是用inviting吗?本人基础好差,
原文就是(狐狸和鹳请客)

答案

it was very kind of you __(invite) me for dinner
it's very kind of sb to do sth固定词组
这边用不定式表示趋向,不用进行时的