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

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

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

18.Great changes ___ (take place),and a lot of factories have been set up.
have taken place
与后面时态保持一致.

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.

take place 没有被动语态,所以用完成时have taken place

have taken place

Great changes( have taken place), and a lot of factories have been set up
前后时态一致, 这里不用被动时态.