Dick is the only one of the teachers who Chinese. He is one of Mary’s friends who been t

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A. know; have
(答案→)B. knows; have
C. know; has
D. knows; has
解析：在定语从句中，one of + 复数名词，前有the （only）时，从句的谓语动词用单数；前没有the （only）时，从句的谓语动词谓语动词用复数。句意：迪克是老师们当中唯一一个知道汉语的老师。他是玛丽的去过中国的朋友中的一个。所以选B。