I opened the cupboard door and then stood in front of it petrified.这里的petrified 从语法上是什么

I have opened the computer为什么不用I had opened the computer When I opened the door,I (get) a big surprise i had opened the box 和 i have opened the boxi had opened the box 和 i have opened the box 什么区别 分别啥意思 had 和 have 怎么用 I never opened my I thought the window must have been opened.(been opened 两个分词在一起是否有错误?解析这部分?） I got surptised when I opened the u_____ gift mu mother sent me.I got surptised when I opened the u_____ gift my mother sent me. S(),the door opened the shop is opened. I shut the door of the mind,because I opened a window i got surprised when i opened the u__gift my uncle sent me I got surptised when I opened the u_____ gift mu mother sent me. 一句不太明白的英文I love the door,which opened just for you I love the door,which opened just for you i got to the classroom first this moring .I found the door____was opening/ was open/ was opened/has opened,选哪个 根据首字母填空 I opened the door only to find them looki根据首字母填空I opened the door only to find them looking at e_ other silently. I opened my eyes and stared up at the night sky through the looming trees. I knocked on the door but nobody _____(填answered还是opened) the door ___ the weather was fine,i opened all the windows.为什么不能用for? 怎么使用so thati opened the door.they could come in.i opened the door so they could come in.i opened the door so that they could come in.可不可以用so that