hanuman_20001. We had hardly sat down at the table, when the phone rang
Both are possible. "A" fits the model sentence better. A. No sooner had we sat down at the table than the phone rang. Here is some more practice for you. http://www.englishpractice.com/lear
1. We had hardly sat down to supper when the phone rang.
A. I had no sooner sat down to supper than the bell rang. (OK) B. No sooner I had sat down to supper than the bell rang. (Wrong verb order.) B. No soonerhad I sat down to supper than the bell rang. (Now OK.) 2. Hardly we had sat down to supper when the phone rang. (Wrong