As they had been  _____ our army for a week, the enemy had no choicebut to surrender (投降). [ ]

A. surrounding                                  

B. surrounded

C. surrounded by                              

D. surrounding with

提高薪酬水平外部竞争性的定位策略（）、跟随型薪酬策略、滞后型薪酬策略、混合型薪酬策略。