He asked Mary whether she had passed the exam A. yesterdayB. the day before C. the day ag

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。