---We all had a lot of fun at the barbecue yesterday. Pity you weren’t there.

---I really should have gone with you, but I ________ on some remaining problems.

A．was working

B．would work

C．worked

D．had worked

下面有关存货系统与其他系统接口的说法，不正确的是（）。

A.存货系统以生成各种单据、凭证方式向总账系统传递数据。

B.存货系统以生成各种单据及账簿方式向成本系统传递数据。

C.成本系统所计算出的存货成本，可作为存货系统的产成品入库单价。

D.本系统可对采购系统、销售系统和库存系统生成的各种单据进行审核记账。