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        1. Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.

          A. since
          B. after
          C. before
          D. when
          C
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          Scientists say it may be five or six years ________ it is possible to test this medicine on human patients.


          1. A.
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          2. B.
            after
          3. C.
            before
          4. D.
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