F: How was your trip to Beijing? ,M: Tiring. There were too many people there. I can hardly find any room to move my arms on the train. Anyhow, I find Beijing a beautiful city.
(A) F: You were very lucky to find a train which was not crowded. (B) F: You went to Beijing by train? That must be very long time. (C) F: You went to Beijing by plane? How was your flight? (D) F: I am afraid I did not quite catch what you were saying. Please repeat it.
B