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    The experts present at the conference all insisted that greenhouse gas emission        be reduced from now on．  

    A．must B．will C．/ D．can

    C

    解析试题分析：句意：出席会议的专家都坚持温室气体排放从现在起要减少。动词insist做为“坚持要求”的时候，后面的宾语从句，用虚拟语气，谓语是should do，should可以省略，所以选C。
    考点：考查虚拟语气

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