Dr Bethune is only 49 years old at that time .指出错误并改正
问题描述:
Dr Bethune is only 49 years old at that time .指出错误并改正
答
Dr Bethune was only 49 years old at that time
Dr Bethune is only 49 years old at that time .指出错误并改正
Dr Bethune was only 49 years old at that time