He is the only one of the students who _____ a winner of scholarship in three years.
A. is        B. are       C. have been     D. has been 

He is the only one of the students in our grade who ______ a winner of scholarship for three years.

A．is 

B．are

C．have been 

D．has been

He is the only one of the students in our grade who ___ a winner of scholarship for three years.

He is the only one of the students in our grade who ___ a winner of scholarship for three years.

He is the only one of the students in our grade who ________ a winner of scholarship for three years

1. A.
   is
2. B.
   are
3. C.
   have been
4. D.
   has been