问题补充:
By the time Mr Wang returned home from Beijing, his sons wedding .
A. ended
B. has ended
C. had been ending
D. had ended
答案:
A. ended
B. has ended
C. had been ending
(答案→)D. had ended
解析:考查时态。by+过去时间,主句用过去完成时,by+将来时间,主句用将来完成时。根据returned可知,这里是指过去的时间,故主句用过去完成时,排除A、B;end“结束”,是短暂性动词,不能用于现在完成进行时,排除C,故选D。