Question

18. Great changes ___ (take place), and a lot of factories have been set up.望详细分析

应该是have吧

Answer 1

答:have taken place.
注意，这个问题十分阴险，因为很容易让人产生误导而填成被动式have been taken place，其实不然，英语中”发生变化”：take place是不用被动语态的，就是直接变成过去式或过去分词就可以了．

Answer 2

have taken place
与后面时态保持一致
意思是发生了许多大变化，许多工厂建立起来。