This being his first visit there,he found a great deal to interest him.这里this是什么用法

问题描述:

This being his first visit there,he found a great deal to interest him.这里this是什么用法
为什么这样用,怎样翻译,

This being ...这是一个独立主格结构.如果去掉This,句子就变成:Being his first visit there,he found ...这时,he就成为being这个分词的逻辑主语了,但是,he和being不能构成逻辑上的主语,这个句子是不成立的.解决的...