Man: That’s the most boring seminar I’ve been to in a long time. Woman: Well, it wasn’t the regular speaker. She got sick at the last minute. Man: I’m surprised they didn’t have a better substitute. Question: What does the man mean
A．They should replace the regular speaker. B．He hasn’t been to a seminar for a long time. C．He didn’t expect the substitute was so poor. D．The substitute was not as good as the regular speaker.