By the time you get to Beijing tomorrow, I ________ for Shanghai.
A) am leaving
B) should have left
C) will leave
D) have already left 答案是b啊 b不是对过去的推测吗 那这句话的意思是
（现在的角度）在明天你到北京之前,我（过去）应该到上海了. 是不是我逻辑有大大的错误啊 求老师骂醒 谢谢!