这两空怎么解释mine和my room不是一样的意思吗

Question

All of ____sudden,there was a knock on _____.
A.the ;the door of mine
B.a ;the door of my room
C./;my rooms door
D.the ;my door
参考答案选B请教一下不选A的理由谢谢~

Answer 1

All of a sudden是一个固定短语
the door of mine 和the door of my room 是一样的

Answer 2

a sudden一瞬间 意思符合
the door of my room 我房间的门,不是我的门

Answer 3

因为你房间的门比你的门更贴切

Answer 4

All of a sudden是一个固定短语 表示'突然'
the door of mine
the door of my room 我房间的门,表达意思比the door of mine 我的门更确切明白.