He asked Mary whether she had passed the exam ．
A. yesterday
B. the day before
C. the day ago
D. before the day
网友回答
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。