He is _____ is known as a hacker (黑客) he likes to show off on the internet and attack websites.
  A. who      B. what       C. that       D. which

Dick is ________ is known as a hacker(黑客); he likes to show off on the Internet and attack websites．

1. A.
   whom
2. B.
   what
3. C.
   that
4. D.
   the man