想问下many a 与more than 的用法

题目

想问下many a 与more than 的用法
more than one _____willing to help him
A.students is B.student are C.student is D.group are
many a _____ passed the driving test
A.people have B.people has C.person have D.person has
请说明下原因 谢谢

答案

more than 意思是比.多,后常跟基数词,eg.more than one 可翻译成不止一个
many a 意思是很多,但后面要跟可数名词单数,是个固定搭配eg.many a student 译为很多学生