It was foolish of him to ____his notes during such an important test, and as a result,   he got punished.      [ ]

A. point to        

B. keep to              

C. stick to        

D. refer to  

以专业营销技巧进行产品推销的同时，预见客户未来的需求并提出建议，以求达成双方长期合作关系并实现双方互利互惠的维护客户关系的方法为（）。

A.情感维护

B.超值维护

C.交叉销售维护

D.顾问式推销维护