英语句子改为被动语态
问题描述：
英语句子改为被动语态
1.About a million tourists visit Florence each year.
2.Ten million people visited London last year.
3.Leonardo da Vinci painted the Mone Lisa.
4.Picasso didn't paint the Mona Lisa.
5.Thousands of workers built the Great Wall of China.
答
1 Florence is visited by about a million tourists each year.
2 London was visited by ten million people last year.
3 The Mona Lisa was painted by Leonardo da Vinci .
4 The Mona Lisa wasn't painted by Picasso.
5 The Great Wall of China was built by thousands of workers