从高中时起，他就梦想成为一名医生。现在，他正努力实现自己的梦想。

从高中时起，他就梦想成为一名医生。现在，他正努力实现自己的梦想。
【正确答案】：He has dreamed of becoming a doctor since high school and is now trying to make his dream come true.