M: I don't think you have time to send out the invitations to all the students. ,F: Oh yes, I will!
(A) M: You need my help? I thought you have sent out the invitations to all the students. (B) M: I am afraid I did not quite catch what you were saying. Please repeat it. (C) M: You have sent out all the invitations? That's great! (D) M: OK. I hope you can send out all the invitations.
D