It was only in 1997 _______ J.K Rowling finished the first Harry Potter story, which is known

as Harry Potter and the Sorcerer's Stone.[       ]

A. when        

B. what          

C. which            

D. that

系统提供了以月为单位的账单显示或打印功能读卡或手动输入卡号，或者填写客户编号，进入查询账单页，可选择账单类型和账单月份，查询账单并导出。