He who has never tasted what is bitter and tough does not know what is sweet and smooth．

【正确答案】 A

【答案解析】A)一B)一C)。解答本题的关键在于理解修饰主语的定语从句的含义。who has never tasted what is bitter and tough修饰He，在翻译时应当注意语序的调整。