When l was watching TV last night,l heard that an awful car accident()(happen)in the city center.是填happen还是has happened还是had happened?上面那个问句是错的,是填happened还是has happened还是had happened?

英语Someone knocked at the door when l (was watching) TVSomeone knocked at the door when l (was watching) TV怎么不是watched when l was 是什么意思 when l was twelve 可以是When I was eating ,my brother was watching The phone rang when Iwas watching TV.对when I was watching TV.提问 翻译：I was watching TV when the alien landed . When/While it began to rain ,I was watching TV 英语翻译I was watching TV when ___ ___ ____. He was watching TV when his mother came home.对watching TV做提问. My mother watching TV when the telephone rang 为什么,mother 与 watching 之间不用加was? My mother was so tired that she fell asleep when watching TV为什么when后用watching而不用watched Were you watching TV when I called you还是when i was calling you?为什么? She was watching TV when I came in.为什么不用was coming? He was watching TV when i was washing clothes. 这句话哪错了,为什么? When i entered the room,i found the boy_______TV a.watching b.was watching.怎么选为什么. i was watching tv when i heard the door(knocking)i was watching tv when i heard someone(knocked)at the door两个knock形式对吗? I heard the noise when i was watching TV(划线部分提问)when i was watching TV划线._______ ________ you ______ the noise? Did you hear someone___at the door when you___TV last night?A.knock,was watchingB.knock,watching C.knock,were watching D.knock,are watching