______ (PHOTOCOPY) ALL THE PAPERS, SARAH PUT THEM BACK IN THE FILE

11. - E 11 3 TONG BT TRAC NGHIEM HK1
E 11 3 TONG BT TRAC NGHIEM HK1
11. ______ (photocopy) all the papers, Sarah put them back in the file.a. having heard b. to have heard