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    9、 So．        the government has a good system of control or car educate the people，the forests will slowly disappear．

        A．if               B．when            C．unless           D．whether

    9、B

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     So．        the government has a good system of control or car educate the people，the forests will slowly disappear．

        A．if               B．when            C．unless           D．whether

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