一道英语题求解答Three criminals escaped from prison yesterday aftern

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一道英语题求解答
Three criminals escaped from prison yesterday afternoon. It was a long time___the guards discovered what has happened.
A.since B.when C.until D.before
这道题考的是什么呢?怎样去分析

D.
It was \ will be + 一段时间 +before . “、、多久之后才、、
It is \ has been + 一段时间 +since... 从、、结束,已多久了
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再问：这里用befored的话应该翻译成守卫发现发生了什么之前有很长一段时间，还是一段很长的时间之后守卫才发现发生了什么
再答：很长时间以后，守卫才发现发生了什么。其实本意是“在守卫发现发生了什么之前，已经过了很长时间。” 明白？

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