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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．a(chǎn)nswer                                                 B．being answered  

C．a(chǎn)nswered                                              D．a(chǎn)nswering

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．a(chǎn)nswer                                                 B．being answered  

C．a(chǎn)nswered                                              D．a(chǎn)nswering

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