A、He has changed his plan. B、He has canceled his trip. C、He is arriving this afternoon. D、He forgot to arrange his trip. A题目询问史密

M: Have you found the trouble with the car?
W: Not yet. The engine works well. I’m checking over the wheels.
Q: What are the two speakers talking about?

M: Shall we go to the airport to meet Dr. Smith this afternoon?
W: Oh, I forgot to tell you. He has put off his trip.
Q: What do we know about Dr. Smith?