2. 外语
  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用在复合句中，通常强调主句动作发生在从句动作之前，表示“先……再……；先……然后……；而后”，如；All things are difficult before they are easy．诸事先难后易。Before I could understand the first question，the teacher had begun the second one．我还没理解第一个问题，老师已开始讲第二个问题了。
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