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20. After a thorough search, the rescue team finally brought the mountain climbers back, ______.

  A. safe and sound                  B. safely and sound

  C. safely and soundly               D. safe and soundly

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19. Experts are trying to work out a plan to deal with the problems caused by global warming ______ it is too late.

  A. when           B. if            C. before         D. until

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