He had no sooner returned than he bought a house.他一回来就买了一套房子.
hardly(scarcely) …when… 这个句型,前面部分用过去完成时,后面部分用一般过去时.
例如：
Saddam had hardly realized what was happening when he was captured.= Hardly had Saddam realized what was happening when he was captured.萨达姆还没有意识到在发生什么事情就被抓获