–Have you studied English for a long time?

--Yes, I have studied it ______.

A. five years before             B. five years ago

C. for five years                D. since five years

---Have you studied English for a long time?

---Yes, I have studied it ______.

1. A.
   five years before
2. B.
   five years ago
3. C.
   for five years
4. D.
   since five years

---Have you studied English for a long time?
---Yes, I have studied it ______.

1. A.
   five years before
2. B.
   five years ago
3. C.
   for five years
4. D.
   since five years