F: This plane should have taken off half an hour ago. ,M: I'm sorry for the delay. We'll be taking off shortly.
(A) F: I’m sorry, I don’t understand. Could you say it again? (B) F: I'm so glad that this plane took off half an hour ago. (C) F: It's OK. I'll wait. But I do hope this plane can take off soon. (D) F: I'm so sad. I was in a bookstore when my plane took off half an hour ago.
C