Great changes___in Shanghai in the past three years.

There( ) great changes in Shanghai in the past few years. Great changes___in the last ten years in China. In the past three years there great changes in Beijing. Great changes _____ in Hainan in the past three years. In the past three years Great changes ()place in shanghai in the past few years (tak Shanghai has changed a great deal in the past five years In the past three years,we ( ) great progress in our study. great changes----in our city in the past three years 1took p __has happend is that in the past three years great changes You___a lot in the past three years. 为什么是in the past three years而不是over the past three years