Tom went to open the door. ______, his father began to wash dishes. [ ] 

A. However     

B. Nevertheless    

C. Besides      

D. Meanwhile

现金付油按照当日（）收取客户现金，并规范找零。对加油卡付油，加油站应遵照《加油卡运营管理规定》执行。

A.挂牌价格

B.付油数量

C.IC卡销售

D.客户需求量