Nowadays people are wasting too much energy, so we should lead a low-carbon life.
          , we’ll suffer a lot in the future.
A．When possibleB．If any
C．If notD．Where necessary
C
考查省略句。句意：現(xiàn)在人們正在浪費太多的能源，因此我們應(yīng)該過一種低碳生活。如果不這樣的話，在將來會遭受痛苦。If not   如果不這樣的話，在這里完整形式為If we should not lead a low-carbon life，所以選C 。
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