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这个句子中为什么要加areThefactthatthetransactionsareacrossnationalbordershighlightsthedifferencesbetweendomesticandinternationaltrade.就是那个transaction后面的are

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这个句子中为什么要加are
The fact that the transactions are across national borders highlights the differences between domestic and international trade.
就是那个transaction后面的are
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答案和解析
  the transactions are across national borders是一个从句,需要谓语.across不是动词,不能做谓语,所以需要加are.