Every possibles means （ ）to prevent the air pollution,but the sky is still not clear.

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• Every possible means _____ to prevent the pollution,but the sky is still not clear.A is used B are used C has been used D have been used A,C 该如何判别?
• 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?
• Every possible means _____ to prevent the pollution,but the sky is still not clear.A is used B are used C has been used D have been used
• Every possible means _____ to prevent the pollution,but the sky is still not clear.
• To my disappointment every possible means —— to prevent air pollution butthe sky is stillnotclea
• Every possibles means （ ）to prevent the air pollution,but the sky is still not clear.
• Every possible means _____ to prevent the pollution,but the sky is still not clear.
• “画龙点睛”现在多来比喻什么?
• 2（x+3）=32 8（x-13）=64 1.5（7-x）=4.5 0.5（6+x）=9 （x+3.2）÷3=8 （x-0.6）÷0.4=1.2．