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    17、Among the most important questions people make ____ is “how to keep the present economic growth without causing damage to the environment?”

    A．answer                                                 B．being answered  

    C．answered                                              D．answering

    17、C

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    Among the most important questions people make ____ is “how to keep the present economic growth without causing damage to the environment?”

    A．answer                                                 B．being answered  

    C．answered                                              D．answering

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