There have been great changes in the country() you visited us last time.

听力原文：There have been many great inventions, things that change the way we live. The fi

Great changes have taken place in China since the introduction of the reform. and opening

The past two decades have witnessed great changes in information technology（翻译)

There has been a change in doctors’ understanding

In the last two hundred years there have been great changes in the method of production of

Great changes have taken place in my hometown since 1978.()