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