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When they went to the theatre, the concert _____ for fifteen minutes.

A. had begun
B. had began
C. had been on
D. was on
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科目:高中英语 来源:0109 同步题 题型:单选题

When they went to the theatre, the concert _____ for fifteen minutes.
[     ]
A. had begun
B. had began
C. had been on
D. was on

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