let‘s welcome them填空（to for at with )dance .

let‘s welcome them填空（to for at with )dance .
let‘s welcome them填空（to for at with )dance .

let‘s welcome them填空（to for at with )dance .
with

with, 译为用舞蹈来欢迎他们。一般不用welcome sb. to do sth. 欢迎某人做某事

let sb do sth,因此to for at可以排除with表示伴随。

Let‘s welcome them with dance.