问题补充:
He asked Mary whether she had passed the exam .
A. yesterday
B. the day before
C. the day ago
D. before the day
答案:
A. yesterday
(答案→)B. the day before
C. the day ago
D. before the day
解析:考查时态,yesterday和一般过去时连用;before用在完成时态中,但是“前天”应表达成the day before (yesterday)。句意:前天他问玛丽是否考试过关了。