He paid the boy ￡10 for washing the windows, most of _____ hadn't been cleaned for a year. [ ]

A. these

B. those 

C. that

D. which

查询设计器中包含的选项卡有

A．字段、联接、筛选、排序依据、分组依据、杂项

B．字段、联接、筛选、分组依据、排序依据、更新条件

C．字段、联接、筛选条件、排序依据、分组依据、杂项

D．字段、联接、筛选依据、分组依据、排序依据、更新条件