正要出去英语词组

Hardly had she gone out when the students came.Scarcely had she gone out when the students came. No sooner had she gone out than the students came. 其中 hardly和 scarcely 的用法一样 是 hardly / scarcely + had done + when + did 而 no sooner 的用法是 no sooner + had done + than did 记住搭配和动词的时态就行了

when用作从属连词,意为“还没 / 刚刚……就”,引导时间状语从句.例如： I had hardly opened the door when he came in.我刚一开门,他就进来了 I had not been reading for half an hour when I heard someone call my name.我刚刚看了半个小时的书,就听到有人叫我的名字. 所以此题正解为：I was going out when the neighbour came to knocked at the door.