问题补充：
If you don’t know the answer to something, you say: “”
A. Sorry, I don’t understand.
B. I’m sorry. I don’t know.
C. Can I speak English?
D. Excuse me. How do you say that in English?
答案：
A. Sorry, I don’t understand.
(答案→)B. I’m sorry. I don’t know.
C. Can I speak English?
D. Excuse me. How do you say that in English?
解析：如果不知道问题的答案，可以用B I’m sorry. I don’t know.对不起，我不知道，或者I have no idea来回答。A，对不起，我不明白。C我能说英语吗？D打扰一下，那个用英语怎么说？只有B符合
故选
