____ can be done ____ been done.

A.All;have          B.All that; have        C.All; has            D.All that; has

4. _____ can be done _____ been done.

  A. All; have         B. All that; have   C. All; has           D. All that; has

____can be done _____been done.

A. All； have            B. All that； have   C. All； has      D. All that； has

All that can be done ____.

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

 All that can be done _______.

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