By the time I got up,My brother had already gotten in the shower.是时间状语从句复合句吗?

问题描述:

By the time I got up,My brother had already gotten in the shower.是时间状语从句复合句吗?
它的主句和从句的时态一致吗?

by the time of+过去时间,表示过去的过去,要是用过去完成时,所以是had already.时态一致那它是复合句吗/好像是吧,就是过去完成时的一个句子