Every possible means ________ to prevent the air pollution，but the sky is still not very clear.
A．were usingB．have used
C．has been usedD．was used
C
答案　C　[考查主謂一致及動詞時態(tài)語態(tài)。means意思是“方式”，被every修飾，謂語動詞用單數(shù)，排除A、B兩項；but后的分詞用了一般現(xiàn)在時，故此處用現(xiàn)在完成時的被動語態(tài)。]
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