"The door is open.Could you have forgotten to lock the door?" "Yes,I_"A could B could have C might have not D can not have为什么选B?求详解

Come in .The door is .(open) The Door Is Always Open 歌词 look,the door is open,为什么open不加ing? Open the door,please. open the door please,-------- ---------? Leave the door open. it is hot outside and keep the door----(open)please He is using a knife____(open)the door. I remember _ (close)the door but the door is open now this is the ( )to your door .you can open the door 中间的空空怎么填 the door is still open,I forget (close) the door 填 to close 还是 closing the door opened为什么不用被动语态?the door opened等于the door is open么?翻译起来一样么？ The door was stayed open 还是The door stayed open The door is open.I have forgotten ____(open)it.适当形式填空 The door is open.Who ____(open)it?Sorry,I dont't know.为什么? Please_______(not open)the door. Please ___(open)the door Open the door,_________ ________?