Great changes _____place.Many new schools .

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/10 19:24:14

Great changes _________place.Many new schools ____.
have taken ,have been opened
现在完成时的被动语态是 have/has been done
为什么在第一句省略了 been

答案是正确的
要看需不需要被动语态其实很简单
只要看主语和谓语的关系
take place 是发生的意思,没有被动语态,它的主语应该是change 而后一句应该是open schools 当schools做主语是就要用被动语态了

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