请帮我看一下下面这个句子中,wether引导是什么从句?同位语从句?

题目

请帮我看一下下面这个句子中,wether引导是什么从句?同位语从句?
Lebsock,meanwhile,attempts not only to write the history of women in one
southern community,but also to redirect two decades of historiographical debate
as to whether women gained or lost status in the nineteenth century as compared
with the eighteenth century.

答案

as to 介词,"至于,关于...",后面跟whether所引导的宾语从句,形成介宾短语.
做to redirect two decades of historiographical debate的修饰状语