1)Complete with the present perfect continuous form of the verb in brackets.

He ...(work) here for over ten years.

•had been working
•has been worked
•has been working


2)My parents ...(donate) to WWF for a long time.

•have been donated
•had been donating
•have been donating


3)They ...(study) very hard for their exams.

•have been studied
•have been studying
•has been studying​