By the time you get to Beijing tomorrow, I for Shanghai.
A. am leaving
B. should have left
C. will leave
D. will have already left
网友回答
A. am leaving
B. should have left
C. will leave
(答案→)D. will have already left
解析：考查时态。根据句中时间状语by the time和tomorrow可知用将来完成时，选D。