F: Will you please help me? I lost my keys and can get into my apartment. ,M: Don't worry, madam. We'll send someone over right away to change your lock and give you a new set of keys.
(A) F: I am afraid I did not quite catch what you were saying. Please repeat it. (B) F: I forgot to change my lock. (C) F: I lost my keys and can get out of my apartment. (D) F: I couldn't find my keys.
D