Sorry,I ________ know the girl.

[　　]

Sorry,I ________ know the girl.

[　　]

– Where is your Chinese teacher? --Sorry, I ___________ know.

A. am not B. isn’t C. don’t D. aren’t

---Do you know that boy?

---Sorry, I ________.

1. A.
   not know
2. B.
   know not
3. C.
   am not know
4. D.
   don't know