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4.Computer is one of the greatestinventions(发明).It's very useful.

分析 电脑是最伟大的发明之一.它很有用.

解答 答案:inventions 根据所给词,可知对应的单词有动词invent和名词invention.根据the greatest(最伟大的),可知其后需要名词.根据one of the greatest,可知其后的名词需要为复数形式,为最…之一.故答案为inventions.

点评 本题考查名词.首先根据汉语,写出单词,其次根据其在句子中的位置和成分,判断出正确的词性,最后,根据one of判断出应为名词的复数形式.

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