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Derivational affixes are affixes added to other morphemes to create new words. Which of the following words does NOT have a derivational affix? （ ）
A、Reread
B、Prewar
C、Postwar
D、Postcard
【正确答案】：D
【题目解析】：D没有派生词缀,它是合成词。明信片的意思。