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    Sometimes, ________ we show our gratitude for a person is reflected in the kind of food we serve him or her.

    A．when B．whether C．why D．how

     

    D

    【解析】考查主语从句。句意为：有时我们如何表达对一个人的感激之情会体现在招待他或她的食物种类上。此处用how作方式状语，引导主语从句，故D项正确。

     

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