​考研难句的理解（the还是that）

考研原句，这个句子感觉语法有点奇怪，把the换成that的话我就能理解。但目前要如何理解？

This is something the mostly happens with all of us.



网友的句子写错了，the 原本就是that：

This is something that mostly happens with all of us.

这个无须进一步推断，改过来即可。