英语长难句求助

题目

英语长难句求助
Probably,there is one here who has not in the course of the day had occasion to set in motion a complex train of reasoning of the very same king,though differing in degree,as that which a scientific man goes through in tracing the causes of natural phenomena.
小弟的疑问是：has not had occasion.中的had怎么理解；
as that which.goes through in 中的that怎么理解,是作为代词“那种”吗?

答案

had就是有的过去分词形式,你可以把in the course of the day去掉,就好理解了,has not had 就是have的过去完成形式.that就是那个的意思,代替前面的degree.