It’s not what we do once in a while ______ shapes our lives, but what we do consistently.

A．which

B．that

C．how

D．when

从“订单”表中删除签订日期为 2004 年 1 月 10 日之前(含)的订单记录，正确的 SQL语句是______。

A．DROP FROM 订单 WHERE 签订日期<={^2004-l-10}

B．DROP FROM 订单 FOR 签订日期<={^2004-l-l0}

C．DELETE FROM 订单 WHERE 签订日期<={^2004-1-10}

D．DELETE FROM 订单 FOR 签订日期<={^2004-l-10}