正确答案是：How long have there been great changes in your city?
对时间状语for...和since.提问时,同样都用how long.
There have been great changes in our city since he became the mayor(画线部分提问since.mayor)
There have been great changes in our city since he became the mayor(画线部分提问since.mayor)
英语人气：164 ℃时间：2019-09-05 07:47:07
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