—Who’s that man? Is he Mr. Brown?

—That     be Mr. Brown. He never walks this way.

A. can’t               B. mustn’t             C. must         D. can

---Who’s that man? Is he Mr. Brown?
---That______be Mr. Brown. He never walks this way.

1. A.
   can’t
2. B.
   mustn’t
3. C.
   must
4. D.
   can