great changes----in our city in the past three years 1took place 2have taken place 2have taken place3were taken place 4have been taken place急-----------理由
问题描述：
great changes----in our city in the past three years 1took place 2have taken place 2have taken place
3were taken place 4have been taken place
急-----------
理由
答
选2.
主语是复数用have，in the past three years要求用现在完成时
答
选2 in the past three years必须和完成时连用，take place无被动
答
2 in the past three years 用现在完成时
take place是不及物动词,没有被动语态的,所以选2