---What should I do first?---The instructions ________ that you should mix flour with water carefully first.A.goB.tellC.writeD.say
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D解析say--(no passive) (of sth. that is written or can be seen) to give particular information or instruction（书面材料或可见的东西）提供信息或指示。如：The clock said 4 o'clock.时钟显示四点整。The notice says“keep out”.告示上写着“禁止入内”。