会计凭证系统不提供（）删除功能，确有需要的，由总行数据中心进行维护
A.凭证种类
B.计量单位
C.凭证编号
D.凭证名称
参考答案：C
把5本书放进2个抽屉中，总有一个抽屉里至少放进______本书．
What would have happened ________, as far as the cliff?
A．if Bob has walked farther
B．if Bob should walk farther
C．if Bob had walked farther
D．if Bob walked farther
