11.(4分)A man escaped from the prison last night. It was a long time ____________ the guards discovered what had happed. A. before B. until C. since D. when

11.(4分)A man escaped from the prison last night. It was a long time ____________ the guards discovered what had happed.
A. before
B. until
C. since
D. when

出自：兰州大学大学英语4

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