—You don’t see the professor from Singapore quite often, do you?

    —No, we only meet ______．

       A．eventually               B．constantly               C．occasionally     D．frequently

—You don’t see the professor from Singapore quite often, do you? 

—No, we only meet ______．

1. A.
   eventually
2. B.
   constantly
3. C.
   occasionally
4. D.
   frequently