— Oh. Mary's not here these days. Is she ill?

— _____. Her mother told me that she was in hospital. [ ]

A. I am afraid so

B. I hope not

C. I don't mind

D. I don't think so

下列关于会计账簿的更换和保管正确的有（）。

A.总账、日记账和多数明细账每年更换一次

B.变动较小的明细账可以连续使用，不必每年更换

C.备查账不可以连续使用

D.会计账簿由本单位财务会计部门保管半年后，交由本单位档案管理部门保管