CHỌN 1 TỪ/CỤM TỪ THICH HỢP CHO MỖI CHỔ TRỐNG TRONG NHỮNG CÂU SAU

E:GIAO ANCAC DE THI THAM KHAO BGD&DTTHU VIEN BO DE THI TRAC NGHIEM CAC CD-DHDE 11

13. We think they …………. all that is necessary.A. have done B. did C. had done D. would do