Nanjing changed a lot in 2003 (用since改写) Tom has collected s

Nanjing changed a lot in 2003 (用since改写) Tom has collected s Nanjing changed a lot in 2004.(用since改写) 初中英语句型转换.Nanjing changed a lot in 2003.(用since改写 but a lot has changed since then Tom has changed a lot since he come to China.怎么提问? 1.Tom has changed a lot since I last saw him. The transportation in Beijing has changed a lot since 2007.该 H____ ,the city has changed a lot since 1980 my hometown has changed a lot since ten years ago 英语翻译Li Ming’s hometown has changed a lot in the past a few y it seems that tom has changed a lot前面为什么用一般现在时 Our school has changed a lot since I left it 为什么,has用原形,而不用过