单项选择题
W: John, it’s 7: 30. I wonder how much later they are going to be
M: Oh, you know Terry and Susan. They never arrive on time.
W: Yes, but half an hour late! My dinner will be mined.
M: Oh, maybe they got stuck in traffic. You know what the traffic is like at this time of day.
W: Yes, but they said they were taking the subway so they wouldn’t get caught in traffic.
M: Well, they shouldn’t be late then. Why don’t you give them a call and see if they’ve left. Maybe they forgot about the invitation.
W: They couldn’t have forgotten about it. I was just talking to Susan last night. Anyway, let me just check if they are in. Their number is 2143556.
A．Perhaps because of the heavy roads.
B．Perhaps because of the subway.
C．Maybe they haven’t got the invitation.