网址：http://m.1010jiajiao.com/timu3_id_2457687[举报]
All that can be done ________ done.
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