·In recent years there have been many changes,可否写成In recent years there were many changes,

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·In recent years there have been many changes,可否写成In recent years there were many changes,
·In recent years there have been many changes,可否写成In recent years there were many changes,

·In recent years there have been many changes,可否写成In recent years there were many changes,
可以,但是语焉不详,recent表示一种常态,所以使用一般进行时就可以了,
in recent years there are many changes 在最近的几年里,这里发生了很多变化,(可能还会有其他的变化)
in recent years there were many changes 在最近的几年里,这里已经发生了很多的变化.

可以,但是不好
recent, recently表示最近,一般来说这种动作持续到现在
可以说他们已经算是完成时的标志性时间状语。