单项选择题
A．Because I have an appointment. B．Sorry about that, but I have to go to a party. C．The reason is that I have to work overtime tonight. D．I'd love to. but I have to finish my paper.
A．You should study harder. B．I've said before that the game takes too long. C．Yes, you get it. D．Sorry, your mother's using the computer now.
A．I want to hear other opinions. B．It certainly is. And I really like the hand. C．Yes, the concert is terrible. D．No, everything went on perfectly.