摘要：A man escaped from the prison last night. It was a long time the guards discovered what had happened. A.before B.until C.since D.when
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A man escaped from the prison last night. It was a long time ________ the guards discovered what had happened.
- A.before
- B.until
- C.since
- D.when
A man escaped from the prison last night. It was a long time ________ the guards discovered what had happened.
[ ]
A．before
B．until
C．since
D．when
A man escaped from the prison last night. It was a long time ________ the guards discovered what had happened.
A. before B. until C. since D. when
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