By this autumn they for ten years .
A. will have married
B. will have been married
C. have been married
D. will be married
网友回答
A. will have married
(答案→)B. will have been married
C. have been married
D. will be married
解析：考查时态。by+将来的时间用将来完成时；by+过去时间用过去完成时。this autumn是将来的时间，故用将来完成时。与一段时间连用，用be married。故选B。