--- Why not go and have dinner in a restaurant?
--- . It’s too expensive.
A. Why not
B. I agree
C. I’m afraid not
D. I’m sure
网友回答
A. Why not
B. I agree
(答案→)C. I’m afraid not
D. I’m sure
解析：考查交际用语：A. Why not为什么不，好啊，B. I agree 同意，C. I’m afraid not恐怕不能，D. I’m sure我确定。句意：--为什么不在饭店吃饭？--恐怕不能。太贵了。选C。