A man escaped from the prison last night. It was a long time________the guards d

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问题 A man escaped from the prison last night. It was a long time________the guards discovered what had happened.

选项 A、before
B、until
C、since
D、when

答案 A

解析句意：昨晚有人越狱了，过了很久警卫才意识到发生了这种事。“It was along time before…”为固定搭配，意为“过了很久才……”，故选A。

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