(2013·哈尔滨四校高三统一检测)The old man often looked back on the past days ________ he worked hard to make a living.

A．which

B．when

C．where

D．that

重要空白凭证库存查询（029168）交易用于（）。

A.对机构库中重要空白凭证状态的查询

B.对客户重要空白凭证状态的查询

C.对柜员物品箱中重要空白凭证状态的查询

D.对柜员物品箱及机构库存重要空白凭证的查询