---Hi, Bob, don't you know me?

---Oh, it's you, Jack. Sorry, I ______ you.

1. A.
   didn't recognize
2. B.
   wasn't recognized
3. C.
   haven't recognized
4. D.
   don't recognize

－Hi, Bob, don't you know me?

－Oh, it's you, Jack. Sorry, I ________ you.

[　　]