很高兴为您解答!
因为long before“很久以前”就认识他了,
long before单独使用,一般用在过去完成时的句自里.它后面可以跟从句构成句型：
It be ...before .before 前一般是long,not long 等词.
before long就是指不久之后,单独用,作状语.New year will come before long.新年不久就到.
希望可以帮到您,
I had known her long before. 为什么要用过去完成时?
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