---Could I borrow your dictionary?- but you have to return it tomorrow.A. I’m sorryB.

问题补充：

---Could I borrow your dictionary?

---, but you have to return it tomorrow.

A. I’m sorry

B. I’m not sure

C. No problem

D. I hope so

答案：

A. I’m sorry

B. I’m not sure

(答案→)C. No problem

D. I hope so

解析：本题的后句意思是明天你必须把字典归还，根据后句意思可知回答语是肯定的回答，no problem是没问题的意思，是肯定的回答，符合题意，故本题选C。