Edison invented ______ devices which are very useful for general

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Edison invented ______ devices which are very useful for general use.(number)
【正确答案】:innumerable
【题目解析】:由题干知,本空在句中作定语修饰devices,故要将名词number改为形容词innumerable,意为:无数的,数不清的。答案为innumerable。

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