请问stand at the door 和stand by the chalkboard,为什么用at和by呢?两者有什么区别?

请问stand at the door 和stand by the chalkboard,为什么用at和by呢?两者有什么区别? stand in the door stand back from the door There is a boy ( )at the door.A.stand B.standing C.stood D.is standing can you stand ()the door?填空 the house 【】【stand】at the. While two detectives were keeping guard at the door请问这里的guard at the door是固定搭配吗? stand at the table翻译 请问 ：The man knocked at the door.the door是宾语吗?这个句子中knocked at the door 是谓语,还是knocked at 是谓语,the door 做宾语 stand at table 和stand at the table 的区别 Wolf At The Door 歌词 knock at the door造句 Wendys at the classroom door . no cover at the door at the door 的意思 at the dear's door stand ____ the subway door[in/to/at/on/]选词填空,我觉得用at,可答案是in,为什么? at the front door和at front door的区别