这里用的是过去完成时,become的分词形式还是become这里用的不是一般式,不能用你那种方法分析（PS：radio and television 这样用and连接起来做主语,后面不能用第三人称单数,要用复数形式.如果是用with连接的才用第三人称单数）
became.by the middle of the twentieth century,both radio and
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