It's nice ---(talk) to you

it's nice talking to you~it's nice doing sth。这里it是形式主语,代表doing sth。同样,it作为形式主语也可以代表 to do sth。于是也可以说成 it's nice to talk to you。当然语法是对的,只是两个to有点拗口。你可以说it's nice to meet you。