属于有效控制系统特征的是（）

A.整体性

B.主观性

C.全面性

D.反馈性

E.促进自我控制

— Were you on time for the meeting?   

— If they ______ me earlier, I would have.  [    ]

A. told    

B. would tell  

C. had told      

D. would have told