Question

---How soon will you finish your college?
---________

1. A.
   After a year
2. B.
   In a year
3. C.
   Before a year
4. D.
   A year before

Answer 1

B
时间短语辨析。After a year一年后，用于过去时态；In a year一年后，用于将来时态；Before a year无此用法； A year before一年前。根据上文，多久你就大学毕业了？可知选B。