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    It will not be long man can harness the solar energy and make it serve mankind. A. since B. before C. when D. after 【查看更多】

     

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    It will not be long _____man can harness the solar energy and make it serve mankind.


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

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    It will not be long _____man can harness the solar energy and make it serve mankind.

    A. since                       B. before           C. when                               D. after

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