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    精英家教网 > 高中英语 > 题目详情

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


    1. A.
      before
    2. B.
      until
    3. C.
      since
    4. D.
      when
    C
    解析：
    本题要突破定向思维，不是It was a long time before句型，注意空格后面的时态是过去完成时，前面是过去时，因此从时间概念上看应该是since．
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