They won't leave until all that can be done is done

They won't leave until all that can be done is done all that can be done been done. All that can be done _______(be)done all that can be done has been done Has all that can be done been done? all that can be done has been done. all ( ) can be done must be done. what is done can't be undone He---back until the work---done.A.isn't;will be B.won't be;w that,can,be,all,that,done,is 组句 并说出意思 can't be done.should be done.should have done all that can be done has been done.中的that为