___at the door ,i'v hardly rung the bell ____ the door opened.为什么用standing ,before?

___at the door ,i'v hardly rung the bell ____ the door opened.为什么用standing ,before? Who is ___at the door?he she they it哪个 While I ___ a novel,someone ___at the door.A.read,was knockingB.read ,knockedC.was reading,knockedD.was reading,was knocking为什么? what___you ___at the store I am near the door.对near the door提问 同义句转换：Don't make any noise.There's someone knocking at the door.Be quiet.There's ___ ___at I don't enjoy myself at the party .改为同义句 I don't ___ ___ ___at the party . Can I open the door?改为祈使句 I forgot clean the door改错 May I s_____ you closing the door? let ___[i] open the door ,please. I forgot -----(锁了）the door I have some ___at school.(friend) They were all ___at the ___news ___ ___at the cinema.(在电影院下车) 填空 1、in the____photo 2、i am ___at the supermarket.3、____you want to have a look? 首字母填空：profess li is not a ___at the monment.should i ask him to call you back. neither my parents nor i ___at home,so noboby could answer the phoneA was B were C is D are