Can you tell me who spoke _ the meetingA:at B:on C:in D:by 答案给的是A,为什么,其他答案有什么不对,为什么on the meeting/in the meeting/at the meeting 都有什么区别,都有没有语法错误

Can you tell me?Who? Can you tell me who she is? who can tell me thank you Who is him,Can you tell me,please?tell me Who can tell me Who can tell me Who Can Tell Me who can tell me who can tell me, who can tell me? thank you .can you tell me who are you?中文 tell me who you Can you tell me who do you like?over again Can you tell me that who you are? Are you still mine?Who can tell me? can you tell me后加WHOM还是WHO? Can you tell me who I am和Can you tell me who am I的区别? Can you tell me who b_ the new world record?Can you tell me who b_ the new world record?