This is they first visited to the Great Wall.中,visited后为什么加to

This is My first This is they first visited to the Great Wall.中,visited后为什么加to this is the first time i'v visited your hometown什么意思 This is not the first This is what they This is what they 急用! This is my first bag中first前要加the吗 this is my first time______（cook） This is my first visit ________ China. first time login,this is a test Around this world ,the last is first. this is ____lesson 1.we first 2.us first 3.the our first 4.our first first,they meet ai zhangpeng is home.next,they can() this is his first time to visit this city this is the first lesson=this is________. this is my first vist__on__Beijing,so everything is new_for__me.对么? this is the first time this was the first time 怎么用,有什么区别? This has been the first time与this is the first time有什么区别