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By notion, words can be grouped into content words and functional words. Which of the following words belongs to functional words?（ ）
A、Five.
B、Sun.
C、Run.
D、And.
【正确答案】：D
【题目解析】：根据有无实义，词汇可分为实义词和功能词。功能词本身不具实义，因此又被称为虚词，包括介词、连词、助动词和冠词。所以选D。