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    21、Had I known that air conditioners cause so much pollution , I _______ one.

    A．would never have bought                    B．would haven’t bought

    C．must never have bought               D．must haven’t bought

    21、A

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    A．would never have bought                    B．would haven’t bought

    C．must never have bought               D．must haven’t bought

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    _____ that air conditioners cause so much pollution, I would never have bought one.

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