—Excuse me, could you tell me where the post office is?
— , but I’m a stranger here．
A. I’m not sure
B. I’m sorry
C. That’s right
D. I’m afraid not
网友回答
A. I’m not sure
(答案→)B. I’m sorry
C. That’s right
D. I’m afraid not
解析：考查日常交际用语。根据上下文语境：打挠一下，你能告诉我邮局在哪吗？很抱歉，我也是一个外地人。I’m sorry, but… 是习惯搭配。