A man escaped from the prison last night. It was a ling time______the guards discovered what had happened.

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问题 A man escaped from the prison last night. It was a ling time______the guards discovered what had happened.

选项 A、before
B、until
C、since
D、when

答案A

解析 句意:昨晚一个人逃狱了。没过多久,守卫就发现了这件事。考查“It+be+时间+before-clause”句型。
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