We mustn't waste water ________ there is not enough water on the earth．


  1. A.
    so
  2. B.
    until
  3. C.
    because
  4. D.
    but
C
because表原因，根據(jù)題意知“我們不允許浪費(fèi)水的原因是地球上沒有足夠的水。”故用because。
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