–Did you see ____ English teacher?  

   --I saw him at ____ work in the office just now.

A. an, /                 B. the, a                C. the, /                 D. the, the

–Did you see ____ English teacher?  

   --I saw him at ____ work in the office just now.

A. an, /                 B. the, a                C. the, /                 D. the, the

.

–Did you see ____ English teacher? 

   --I saw him at ____ work in the office just now.

A. an, /                 B. the, a                C. the, /                 D. the, the

.
–Did you see ____ English teacher? 
--I saw him at ____ work in the office just now.