１：Ｇreat changes______in the past few years.1:taken piace 2: took piace 3: have taken pice 4:have been taken piace.请选择．为什么？
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3: have taken place 首先你要知道：take place和happen都是不及物动词或短语，不能用于被动语态。其次：in the past few years常和现在完成时连用同样的还有：over the last thirty years也是和现在完成时连用的
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黑羽信的回答非常正确。 完全同意
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c have taken place
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选4，首先复数，然后被动，变化不能自动发生，一般in the past few years加完成式。
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选三，不是piace是place是过去完成时态