A reward has been announced for the employees who ___ hard.
have worked
has worked
will be work
have had worked
Explanation:
Correct Answer is: have worked
Relative pronoun এর antecedent অনুসারে verb বসে। এখানে who এর antecedent হচ্ছে The employees. এইটি plural তাই পরের verb টিও plural.