many a teacher and many a student-------taken part in the st

many a teacher and many a student_______taken part in the stormy discussion. A.have B.has我知道一个many a 连接单数名词,表复数意义,单数位于动词用单数.单数两个many a 用and 连接呀?要很确定的回答.我看过类似的提问,两种都有人支持.不敢确定哪个是对的.