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  3. A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

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

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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 before和after既可作介词，也可作连词，用来引导时间状语从句。
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