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    15、We must ________measures to protect our earth from ________．

    A．do；being polluted                                   B．get；polluted

    C．take；being polluted                                   D．have；polluted

    15、C

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    We must ________measures to protect our earth from ________．

    A．do；being polluted                                   B．get；polluted

    C．take；being polluted                                   D．have；polluted

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