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
great changes----in our city in the past three years 1took place 2have taken place 2have taken place
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
3were taken place 4have been taken place
急-----------
理由
英语人气：965 ℃时间：2019-12-07 06:14:43
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