问题补充:
(·西安市高三二模)—John looks a bit upset. Did you tell him the bad news?
—Yes, but I him after his birthday party.
A. should have told
B. must have told
C. shouldn have told
D. needn have told
答案:
(答案→)A. should have told
B. must have told
C. shouldn have told
D. needn have told
解析:选A句意:“约翰看起来有点伤心,你把那个坏消息告诉他了吗?”“是的,但我本应该在他生日后告诉他。”表示本应该做某事用should have done。