Question

—__________ will your father be back?
—In two months

1. A.
   How long
2. B.
   How soon
3. C.
   How often
4. D.
   How many

Answer 1

B
疑问代词辨析。how long 多长时间 how soon 多久才会 how often 多久一次 how many 多少（修饰名词复数）。根据答语“两个月后”可知问题“你爸爸多久才会回来？”故选B。