Much to surprise of the students the concert which was held once a year turned out to be

问题补充：

Much to surprise of the students, the concert which was held once a year turned out to be complete failure.

A. /; a

B. the; a

C. the; /

D. /; /

答案：

A. /; a

(答案→)B. the; a

C. the; /

D. /; /

解析：考查冠词。句意“令学生们感到吃惊的是，这次举办的、一年一次的音乐会结果证明是一次彻底的失败。”the+名词+of...是固定搭配；指具体的失败时，failure是可数名词。故选B。