Of the following groups of words, "（ ）" has the same grammatical meaning.
A、sit, sitting, sat
B、fast, quick, quickly
C、tables, men, potatoes
D、forget, forgets, forgotten
【正确答案】：C
【题目解析】：本题考查语法意义。Grammatical meanings refer to that part of meaning of the word which indicates grammatical concept or relationships such as part of speech of words, singular or plural meaning of nouns, tense meaning of verbs and inflectional forms.语法意义是指词义中表示语法概念或关系的部分，如词汇的词性部分、名词的单数意义和复数意义。动词的时态意义及其变体形式。A选项分别为：动词原形，分词形式、过去式B选项分别为：形容词、形容词、副词C选项三个均为：名词复数D选项分别为：动词原形、第三人称单数、过去分词。故只有C选项具有相同的语法意义，故选C。
