A
首先,在Do you know everybody ______came to the party?中,缺的是主语,先行词是everybody用who哦·在定语从句中,关系代词做主语时不可以省略哦·
在But I don-t know the one ______you talked with near the door.缺的是宾语
即：you talked with the one 在定语从句中,关系代词做宾语时可以省略哦·