Many a student has made that mistake before.请说明理由.
问题描述：
Many a student has made that mistake before.请说明理由.
答
很多同学在之前都犯过这个错误
答
许多学生以前都犯过那个错误.
many a 是一个短语 意思是许多 和many一样的意思 但后面要接名词单数