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    精英家教网 > 高中英语 > 题目详情
    The trouble with such resources as coal, oil and gas ______ that they are not renewable.
    A．was B．areC．have beenD．is
    D

    试题分析：句意：象煤，油和气这样的资源问题是它们不是可再生的。这句话是客观事实，所以用一般现在时，又因为主语是the trouble所以谓语用单数，所以选D。
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