Once, Aunt Petunia, had taken a pair of kitchen scissors and cut his hair so short （）he was almost bald except for his bangs. 小说里面的一段话，小说用的是一般过去时，所以强调之前的动作用了过去完成时。【疑问】1，句中"（）"处是否省略了结果状语从句的that？2，结果状语从句里边可否用have been替代was（头发就是刚剪的时候很短，后来又长出来了）?谢谢！