【题目】- What have you been doing since we from Northwest University?
- I’ve been doing business.
A. graduated B. have graduated
C. had graduated D. graduate
在线课程【答案】A
【解析】考查动词时态。上句：自从我们从西北大学毕业你一直在做什么？下句：我一直在做生意。Since自从---以来，引导时间状语从句，主句用现在完成时态或现在完成进行时态从句用一般过去时态。故选A。