— Are you a teacher?

     — No, but I ____. I worked in a middle school for three years.

     A. am   B. will   C. do   D. was

— Are you a teacher?

— No, but I ____. I worked in a middle school for three years.

— Are you a teacher? 

— No, but I ____. I worked in a middle school for three years.

1. A.
   am
2. B.
   will
3. C.
   do
4. D.
   was

— Are you a teacher?

— No, but I ____. I worked in a middle school for three years.

A. am                B. will             C. do             D. was

---- Are you a teacher?

----No, but I_________.I worked in a middle school for three years.

A．am          B．will            C．do        D．was