China has changed a lot since fifty years ago.
There have been lots of changes to China in the past fifty years.
注意:changes是可数 的复数,所以前面用lots of ,所以前面是 have been.
China has changed a lot since fifty years ago.
There have been lots of changes to China in the past fifty years.
注意:changes是可数 的复数,所以前面用lots of ,所以前面是 have been.