All that can be done ________ done.

A. has been

B. have been

C. has

D. have

A. has been

B. have been

C. has

D. have

All that can be done. _______.　

a. has been don b. has done c. have done d. were done

All that can be done ______.

A.has done　　 B. has been done　　　　 C. have done　　 D. have been done

All that can be done ____.

        A.has been done     B.have been done   C.have done     D.has done