一个英语句型,

题目

一个英语句型,
But it is a little upsetting to read in the explanatory notes that a certain line describes a fight between a Turkish and a Bulgarian officer on a bridge off which they both fall into the river
请问这个是什么结构,其中it指代什么,that是同位语吗?

答案

explanatory notes 是注释说明的意思注释说明中有那么一行专门描述两个分别来自土耳其和保加利亚的军官在一座桥上打架结果掉到河里的事,读到这儿时,真让人觉得苦恼沮丧.（总的是个形式主语和真主语的问题,it 是形式...