By the time you get to Beijing tomorrow,I ____2____ for Shanghai.By the time you get to Beijingtomorrow,I ____2____ for Shanghai.A) am leavingB) should have leftC) will leaveD) have already left(B)为什么D不可以?

问题描述:

By the time you get to Beijing tomorrow,I ____2____ for Shanghai.
By the time you get to Beijingtomorrow,I ____2____ for Shanghai.
A) am leaving
B) should have left
C) will leave
D) have already left(B)
为什么D不可以?