What were you doing ______there was a knock at the door?A.wh

they were i______ by a knock at the door there was a knock on the door. There was a knock at the door.It was the second time someone He was sleeping when there was a loud knock at the door.[对sl A knock at the door __him .A,interrupted B was interrupted C A knock at the door( ）him.a .interrupted b.was interrupted c The Greens （）（have）supper when there was a knock at the door while he was reading the letter,he heard a knock at the door There was a knock at the door.(改为同义句)_____ ______ ______ the There was a loud knock at the door.(用时间状语从句合并成一个句子) There was a knock at the door when we () () (have) supper he was falling ____(sleep) when he geard a knock at the door