every后面不是加单数可数名词,为什么要说every means 而不能说every mean?

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• every后面不是加单数可数名词,为什么要说every means 而不能说every mean?
• every后面不是加单数可数名词,为什么要说every means 而不能说every mean?
• To my disappointment every possible means —— to prevent air pollution butthe sky is stillnotcleaA.are being used B.have been usedC.has been usedD.had been used选什么 为什么
• Every possibles means （ ）to prevent the air pollution,but the sky is still not clear.A.is used B.are used C.has been used D.have been used哪一个?为什么?