汉译英 过去的30年里中国经历了巨大的变化

Great changes have taken place in China in the past 30 years.

china had experienced great changes in the past 30 years
楼上的是发生，我是经历

China has experienced a huge change in the past 30 years.

Great changes have taken place in the past 3 decades.
China have seen great changes.

In the past 30 years,many great changes has taken place in China.