【题目】The girl had hardly rung the bell the door was opened suddenly, and her friend rushed out to greet her.
A. before B. until
C. as D. since
在线课程【答案】A
【解析】根据 “rung the bell” 和 “the door was opened “的发生先后, 可以得出答案。句子的含义是：女孩还没来得及按门铃, 门就突然打开了。她的朋友们一拥而上去欢迎她。