---Could I swim here?
--- . Look at the sign NO SWIMMING.
A. No, you couldn’t
B. Certainly, you could
C. Sorry, please don’t
D. Of course, you can
网友回答
A. No, you couldn’t
B. Certainly, you could
(答案→)C. Sorry, please don’t
D. Of course, you can
解析：根据 Look at the sign NO SWIMMING.可知，应该是表示不能游泳，故排除BD；A选项的回答不是很有礼貌，不如C选项有礼貌。所以本题选C。