◎ 题干
When they went to the theatre, the concert _____ for fifteen minutes.
A. had begun
B. had began
C. had been on
D. was on
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“When they went to the theatre, the concert _____ for fifteen minutes. [ ]A. had begunB. had beganC. had been on D. was on …”主要考查了你对  【过去完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。