Somebody knocked at the door while I___

Somebody knocked at the door while I___ 是knocked at the door还是knocked on the door While I was watching TV, someone knocked at the door . 怎麼翻译 What___you___when someone knocked at the door? someone knocked( )the door while i( )my housework the man knocked l_ at the door now. I knocked at the door as if i knocked at my own.的时态 I () my brother when someone knocked at the door She went d_____to see who knocked at the door. 18. He knocked at the door _________ no one answered. He was having dinner____a unknown woman knocked at the door. ____ night,a stranger knocked at the door.