The door opened ______ (by itself / of itself). 究竟哪个正确?

The door opened ______ (by itself / of itself). 究竟哪个正确? the door opened by itself the door was open by itself哪一个对 I was going to open the door when it opened of itself.什么意思? 单句改错：The door has been opened itself The door closed of itself的汉语意思是什么 如何判断是of itself 还是 by itself? A group ______ itself the League of Red Scarves. robot,clothes,the,washed,itself,yesterday,by he opened the door------（with,by,of） his sky.选用正确的介词填空 THE SCORE TAKES CARE OF ITSELF怎么样 the piece of meat is on the plate by itself翻译成中文 who closed the door?nobody,_____________ A it closed itself