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20.Over 1,500 languages are spoken in the world.

分析 世界上有1500多种语言在被说.

解答 答案:spoken.
首先结合首字母s根据语境推测句意是"世界上有1500多种语言在被说.",句子表述的是一般性的事实,所以用一般现在时,主语  languages 是动作 speak的承受者,所以用被动语态,一般现在时被动语态的构成是:主语+am/is/are+动词的过去分词,所以答案是:spoken

点评 做这类题型,首先根据所给单词首字母明确句子所要考查的单词的拼写,再结合相关语法知识对单词做出形式上的变化.

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