when he ( )the door ,he found his keys were nowhere.A.would open B.opened C.had opened D.was to open为什么答案选D,为什么不选B,在时间状语从句中,不是可以用过去时表过去将来时吗

I _____just______(fall)asleep when he knoched on the door 用首字母填空 When he left the room,he will c__ the door. When he opened his door,he found everything in the room was g___ when he wpke up,he heard the_of knocking at the door. 翻译:when kevin opened the door,he saw a white cat sitting in front of the door. He was just falling asleep when someone knocked at the door.(改写同义句)He was just ___ to sleep when ___ was a ___ at the door. Peter was about to unlock the door when he found someone had broken into the 首字母填空：When the parrot is hungry,he knocks on the cage door with his b_. The 8-year-old boy hid __________(he) behind the door when playing hide-and-seek. he was still smiling when the door opened and his wife came inthe door opened,我听过open the door,这里是怎么回事? I was studying English when he knocked at the door.改错 Yesterday my father f____to lock the door when he left home. yestrday my father f_____to lock the door when he left home When he knocked at the door,my aunt was ________ （cook） dinner. He was sleeping when there was a loud knock at the door.[对sleeping提问] when his parents were sleep,he s______opened the door and went away He was having dinner____a unknown woman knocked at the door.填when还是while? he was sleeping late____someone knocked on the door 1.when 2.while 3.as 4.after