A patent gives inventors exclusive rights to their inventions for a fix period of time.

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问题 A patent gives inventors exclusive rights to their inventions for a fix period of time.

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答案fix—fixed

解析译文：专利给予发明者一段特定的时间独享他们的创造成果。
分析：考查词性。fix是动词，这里要用形容词fixed修饰名词period。

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