问题
选择题
By this autumn they _____for ten years .
A．will have married
B．will have been married
C．have been married
D．will be married
答案
答案：B
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。