第1个回答 2013-05-30
There have been great changes in my hometown in recent years/
第2个回答 2013-05-30
There were (或者用happened)many great changes in my hometown in past few years.
第3个回答 2013-05-30
there were great changes in my hometown in the last few years
第4个回答 2013-05-30
There have been, in/during ( the )last/past few years