题目内容
（请给出正确答案）
[主观题]
Guest: Oh, I hadn't realized how late it was. I'm afraid I'll have to be going.Host: Oh, n
ot 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
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