题目内容
根据中文、英文解释或所给单词,用正确形式填空
A lot of changes _______ (happen) in Nanjing in the past three years.
答案:have happened
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题目内容
根据中文、英文解释或所给单词,用正确形式填空
A lot of changes _______ (happen) in Nanjing in the past three years.