正確答案是：How long have there been great changes in your city?
對(duì)時(shí)間狀語for...和since.提問時(shí),同樣都用how long.
There have been great changes in our city since he became the mayor(畫線部分提問since.mayor)
There have been great changes in our city since he became the mayor(畫線部分提問since.mayor)
英語人氣：136 ℃時(shí)間：2019-09-05 07:47:07
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