下面的语句中to the point of impossibility是什么类型的状语?

下面的语句中to the point of impossibility是什么类型的状语?
It is difficult to the point of impossibility for the average reader under the age of forty to imagine a time when high-quality arts criticism could be found in most big-city newspapers.to the point of impossibility是什么类型的状语?修饰谁?请英语高手作答!
to the point of impossibility中文意思！jhu_james你错啦！我就是像你这样划分的！to the point of impossibility 是状语，不是真正的主语！the average reader under the age of forty to imagine a time 这才是真正的主语！
该语句的大致意思：让平均年龄在四十岁以下的读者想象出高品质艺术评论出现于大多数大城市报纸的盛世是困难，也是不可能的！