【正确答案】：
AS HOMONYMS ARE IDENTICAL IN SOUND OR SPELLING, PARTICULARLY HOMOPHONES, THEY ARE OFTEN EMPLOYED TO CREATE PUNS FOR DESIRED EFFECT OF HUMOR, SARCASM OR RIDICULE. LONG TIME NO SEE IS USUALLY SAID AS A FORM OF GREETING BETWEEN TWO FRIENDS WHEN THEY MEET AFTER A LONG TIME. HERE THE CUSTOMER CLEVERLY EMPLOYED THE STRUCTURE OF THE IDIOM TO HIS ADVANTAGE TO CRITICIZE IN A HUMOROUS WAY THE BAD QUALITY OF THE FOOD SERVED AT THE RESTAURANT. LONG TIME NO SEA IMPLIES THAT 'SEA FOOD KEPT FOR A LONG TIME IS NOT FIT FOR EATING'. 
【题目解析】：由于同形同音异义词在发音或拼写上都是相同的，尤其是同音异义词，所以它们经常被用来制造双关语，以达到幽默、讽刺或嘲笑的效果。好久不见通常是两个朋友很久之后相见的一种问候方式。在这里，顾客巧妙地运用了这个习语的结构，以一种幽默的方式批评了餐馆里供应的食物质量不好。“长时间无海”意味着“长时间保存的海鲜不适合食用”。