Every possible means ________ to prevent water pollution, but we still have not enough clean water．


  1. A.
    has been used
  2. B.
    are used
  3. C.
    were used
  4. D.
    have been used
A
考查時態(tài)和主謂一致。means前有every修飾，謂語動詞只能用單數(shù)，且根據(jù)語境we still have not enough clean water可知到現(xiàn)在為止我們已經(jīng)使用了每一種可能的方法，故選A。
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