—Would you like to join me for a quick lunch before class?— but I promised Nancy to go ou

问题补充：

—Would you like to join me for a quick lunch before class?

—，but I promised Nancy to go out with her.

A. Id like to

B. I like it

C. I don

D. I will

答案：

(答案→)A. Id like to

B. I like it

C. I don

D. I will

解析：简略答语中省略动词，只保留动词不定式符号。