The days when he was_________ his best is already a thing of the past.

The days when he was_________ his best is already a thing of the past.

1. A.
   in
2. B.
   on
3. C.
   at
4. D.
   with

The days when he was_________ his best is already a thing of the past.

A. in              B. on             C. at               D. with

The days when he was_________ his best is already a thing of the past.

 The days when he was_________ his best is already a thing of the past.

  A. in              B. on                  C. at              D. with