I am sorry I can’t meet you at the station. I by the time you e back from abroad.
A. am leaving
B. had left
C. will have left
D. have left
网友回答
A. am leaving
B. had left
(答案→)C. will have left
D. have left
解析：考查时态。by+过去的时间，主句使用过去完成时；by+将来的时间，主句用将来完成时。by the time you e back from abroad所知的时间是将来，故主句用将来完成时，即will have done sth。故选C。