中国那时候已经有了自己的工程师（改为反问句） 中文英文版对照：

1. 难道中国那时候没有自己的工程师吗？
1：do not have their own engineers at that time?
2. 中国难道那时候没有自己的工程师吗？
2 China is not that time to have their own engineers?
3. 中国那时候难道没有自己的工程师吗？
3 China at that time do not have their own engineers?
4. 中国那时候怎么可能没有自己的工程师呢？
4. How could China not have its own engineers at that time?
5. 中国那时候已经有了自己的工程师，难道不是吗？
5 China has its own engineers at that time, isn't it?