It will be a long time ________ we finally solve the problem of pollution．


  1. A.
    before
  2. B.
    since
  3. C.
    when
  4. D.
    Until
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Most probably it will be another 7 hours _____ you can have next meal, so each of you must have your stomach full.

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B．It causes water shortages around the world.

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