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As most words have more than one meaning, it is often impossible to tell the meaning of a word before it is used in_______.
A、context
B、texts
C、conversation
D、writing
【正确答案】：A
【题目解析】：题干中提及一词多义性，要确定一个单词的含义需要具体的上下文，因此，A为正确答案。