(2013·山东，23)—How far can you run without stopping?
— .I've never tried.
A. Don't mention it
B. That's all right
C. I have no idea
D. Go ahead
网友回答
A. Don't mention it
B. That's all right
(答案→)C. I have no idea
D. Go ahead
解析：考查交际用语。根据后句“我从未尝试过”，可知“我不知道”。故答案选C。