Every possible means ________ to prevent the air pollution, but the sky is still not very clear．


  1. A.
    were using
  2. B.
    have used
  3. C.
    has been used
  4. D.
    was used
C
本題考查主謂一致及動(dòng)詞時(shí)態(tài)語態(tài)。means意思是“方式”，被every修飾，謂語動(dòng)詞用單數(shù)，排除A、B兩項(xiàng)；but后的分詞用了一般現(xiàn)在時(shí)，故此處用現(xiàn)在完成時(shí)的被動(dòng)語態(tài)。
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