A man escaped from the prison last night. It was a long time______the guards dis

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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

解析连词用法。犯人越狱发生在警卫发现之前，It was…before意为“(……之后)才……”，符合题意；until意为“直到……为止，直到……才”，一般不用于It was…until肯定句中。故答案为A。

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