请问as在这句话中的意思和作用分别是?
问题描述：
请问as在这句话中的意思和作用分别是?
As this is the first time you have come to Guangzhou,I think we'd better have a sightseeing tour around it.
是不是作“既然”?
AS引导了什么从句?
答
“既然
原因状语从句