听力原文:M: I've been calling David for the past half hour, but I keep getting a busy sign
W: Well, if you don't get him soon, we'll just have to go to the movies without him.
Q: Why is the man trying to call David?
(19)
A.To tell him they are busy.
B.To cancel an appointment.
C.To send him a busy signal.
D.To invite him to go to a film.