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        1. Experts are trying to work out a solution to save the miners _____ its too late.

          A. before
          B. since
          C. unless
          D. when
          A
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          科目:高中英語 來源:四川省模擬題 題型:單選題

          Experts are trying to work out a solution to save the miners _____ its too late.
          [     ]
          A. before
          B. since
          C. unless
          D. when

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