M: Hello, Tom Smith. ,F: Hello, Tom, it's Mary Clark. My secretary said you called just now? ,M: Yes. Thank you for calling back. I wanted to make sure you've received the invitation. ,F: Yes, I have. I'd be glad to accept it.
(A) M: I want to know if you work on the 17th. (B) M: I am afraid I did not quite catch what you were saying. Please repeat it. (C) M: I am happy that you received the invitation. (D) M: I want to make sure your friends have received the invitation.
C