The teachers ________ the office for a few minutes when we arrived．We didn’t meet them．

1. A.
   had been away from
2. B.
   had left
3. C.
   have been away from
4. D.
   have left

The teachers_________ the office for a few minutes when we arrived．We didn’t meet them．

A． had been away from                B． had left

C． have been away from               D． have left