The grandest of these ideals is an unfolding American promise that everyone belongs, that everyone deserves a chance that no insignificant person was ever born. Americans are called to enact this promise in our lives and in our laws. And though our nation has sometimes halted, and sometimes delayed, we must follow no other course.

在财务开支发生时经办人先垫款，后直接拿原始报销凭证到财务部门进行报销，这种情况应该在财管系统中填写何种单据（）

A、河北农信借款单

B、河北农信报销单

C、河北农信会议费报销单

D、河北农信还款单