they walked as far as------the station 为什么这里要填as far as,不填so

they walked as far as------the station 为什么这里要填as far as,不填so He walked as far as the railway station yesterday evening. as far as.so far as far as／so far as／so far／as long as／so long as so far as造句 请问as/so far so far as,so long as,as far as,so far as的区别? so far as 和as far as的区别 as far twice as far as as/ so far as 怎样造句? so long as和as far