问题补充:
By the time you come back, your aunt for Nanjing to attend a meeting.
A. will leave
B. leaves
C. left
D. will have left
答案:
A. will leave
B. leaves
C. left
(答案→)D. will have left
解析:考查时态,by+时间状语,句子通常用完成时态,根据从句By the time you come back,可知指将来,所以用将来完成时。选D。