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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】考查主語從句。句意為:有時我們如何表達對一個人的感激之情會體現在招待他或她的食物種類上。此處用how作方式狀語,引導主語從句,故D項正確。

 

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