there have been great changes为什么用have been

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there have been great changes为什么用have been
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there have been great changes为什么用have been
there have been great changes为什么用have been

there have been great changes为什么用have been
句子的意思是这里发生很大的变化
这种变化是已经发生的,并且影响到现在所以要用have been现在完成时

已发生的事情当然要用过去时态了