in the past few years there____ great changes in my hometown

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in the past few years there____ great changes in my hometown.
A.have taken place
B.have been
C.have happened
D.were
答案选的是B,麻烦给个解析（为什么选B）

先说A take place 也是发生的意思但是通常用法是 sth take place ,A的用法显然不符合习惯
C也是sth happen B和D都是be动词但是时态不一样句子的意思是说过去的一些年里,我的家乡有很大变化过去式强调过去发生,完了也就完了,不会对现在有影响,但完成时强调对现在的影响,所以应该选B

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