Father often says to me,“Be ________ honest boy today and ________ useful man tomorrow.”

1. A.
   a；a
2. B.
   an；an
3. C.
   a；an
4. D.
   an；a

Father often says to me,“Be _____ honest boy today and _____ useful man tomorrow.”   

A.a; a        B.an; an        C.a; an                D.an; a