A prisoner escaped from prison last night. It wasn’t long ________ the guards discovered what had happened.

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问题 A prisoner escaped from prison last night. It wasn’t long ________ the guards discovered what had happened.

选项 A、until
B、before
C、since
D、when

答案B

解析 It wasn’t long before…为固定句型,意为“没过多久就……”,其中before引导的是时间状语从句。until:直到……为止,引导时间状语从句;since:自……以来,因为,引导时间和原因状语从句,“It is/has been/was+一段时间+since…”为固定结构,意为“自……以来已经多久了”,其中be动词为is或has been时,从句用现在完成时,be动词为was时,从句用过去完成时;when:当……时,引导时间状语从句。故选B。
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