(2013·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't have told
D. needn't have told
网友回答
(答案→)A. should have told
B. must have told
C. shouldn't have told
D. needn't 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。