They were determined to carry out the plan at first, but then we ________ persuade them to

change their minds.[      ]

A. would  

B. could

C. were able to  

D. had to

加油站服务规范要求员工在岗时坐姿要（）。

A.端正，不前俯后仰，不东倒西歪，不摇腿翘脚

B.挺.直.高

C.身体协调.姿势优美

D.随意舒适