When I passed Mr Black’s office, he our exam results with the head teacher.
A. discusses B. is discussing
C. discussed D. was discussing
When I passed Mr Black’s office, he our exam results with the head teacher.
A. discusses B. is discussing
C. discussed D. was discussing
D。考查时态。根据时间状语从句中的passed可知: 主句时态要用过去进行时。故选D。