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解题思路： 如下
解题过程：
1. My father has been to Japan twice. （对划线部分提问）
How many times has your father been to Japan？
对次数提问用how many times。
2. The young man traveled there by plane yesterday. （对划线部分提问）
How did the young man travel there yesterday?
对交通方式提问用how。
3. The girls are having a wonderful time in China now. （改为同义句）
The girls are enjoying themselves in China now.
have a wonderful time=enjoy oneself意为“玩得开心”
4. My uncle flew to Beijing yesterday. （改为同义句）
My uncle went to Beijing by plane/air yesterday.
fly to …= go to …by plane/air 意为“坐飞机去某地”
5. Since then over 400 million people have visited Beijing. （改为同义句）
Since then more than 400 people have visited Beijing.
over = more than 意为“超过，多于”
最终答案：略