By the time you come back your aunt for Nanjing to attend a meeting.A. will leaveB. leav

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。