独立主格 时态The last bus having gone,we had to walk home.为什么用having goneAll the money having been spent,we started looking for work.为什么用having been spent不是问被动，而是完成进行时
问题描述：
独立主格 时态The last bus having gone,we had to walk home.为什么用having gone
All the money having been spent,we started looking for work.为什么用having been spent
不是问被动，而是完成进行时
答