Guest: Oh, I hadn’t realized how late it was. I’m afraid I’ll have to be going.Host: Oh, not yet. I’m just going to make some coffee.Guest: ______ , though I’d really love to stay. I’ve got to be up by six tomorrow morning, unfortunately. Thank you for a wonderful party.
A．I’m sorry, but I must B．Excuse me, but I have to go C．Pardon me, but I should go D．It’s a pity, but no way out