—I would like to speak to Mr. Martin.

—There’s nobody here by that name.

—Sorry, I ______ the wrong number.

1. A.
   should have dialed
2. B.
   must dial
3. C.
   could have dialed
4. D.
   must have dialed

 —I would like to speak to Mr. Martin.

—There’s nobody here by that name.

—Sorry, I ______ the wrong number.

A. should have dialed                 B. must dial 

C. could have dialed                 D. must have dialed