--I’m sorry I didn’t make it to your party last night.-- I know you’re busy these days.A

问题补充：

--I’m sorry I didn’t make it to your party last night.

-- , I know you’re busy these days.

A. Of course

B. No kidding

C. That’s all night

D. Don’t mention it

答案：

A. Of course

B. No kidding

(答案→)C. That’s all night

D. Don’t mention it

解析：句意：--对不起我昨晚没有参加你的晚会。--没关系，我知道你这些天一直在忙。Of course当然；No kidding不要开玩笑；That’s all night没关系；Don’t mention it不用谢。根据句意故选C。