这句话中的as是什么用法?to which引导的是什么从句?I have no definite information yet as to which route he will take.
问题描述：
这句话中的as是什么用法?to which引导的是什么从句?
I have no definite information yet as to which route he will take.
答
as to 词组 关于的意思
which引导宾语从句