指导书上说that was where we camped last time是一个定语从句,可是表语从句不应该是 where we camped

指导书上说that was where we camped last time是一个定语从句,可是表语从句不应该是 where we camped
指导书上说that was where we camped last time是一个表语从句，可是表语从句不应该是 where we camped lasttime这个部分吗？