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：
本題要突破定向思維，不是It was a long time before句型，注意空格后面的時(shí)態(tài)是過去完成時(shí)，前面是過去時(shí)，因此從時(shí)間概念上看應(yīng)該是since．
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