—How long have you learnt English?
---         .

—How long have you learnt English?

---         .

A．Since 2008        B．In 2008           C．4 years ago        D．since 4 years

—How long have you learnt English?
---         .

1. A.
   Since 2008
2. B.
   In 2008
3. C.
   4 years ago
4. D.
   since 4 years

---How long have you learnt English?

--- .

A. Since 2008　 　B. In 2008　 　C. 4 years ago 　D. since 4 years