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

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

1,B
2,C
many a ， 尽管它表示“许多”但其后的名词要用单数，且谓语动词也要用单数
4) Let's carry out the test with more than the sample copy.

C. “More than＋形容词”等于“很”或“非常”的意思，如：

5) In doing scientific experiments, one must be more than careful with the instruments.

6) I assure you I am more than glad to help you.

D. 在“More...than...”中，肯定“more”后面的而否定“than”后面的，约等于“是……而不是……”如：

7) The difference between pure linguistics and applied linguistics is more apparent than real.

8) This book seems to be more a manual than a text.

9) Catherine is more diligent than intelli-gent.

10) Hearing the loud noise, the boy was more surprised than frightened.

E. “More than”或“More...than...”＋含“can”的分句时表示“否定意”，如：

11) That's more than I can do.