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    精英家教网 > 高中英语 > 题目详情

    ________ the safety of gas, the government has checked the city’s gas supply system thoroughly．

    [　　]
    A．

    To ensure

    B．

    Ensuring

    C．

    Having ensured

    D．

    To have ensured

    答案：A
    解析：

    句意为：“为了保证用气安全，政府已经彻底检查了城市的供气系统。”考生应根据上下文和语意判断出本句考查非谓语动词作状语，而目的状语往往用不定式来充当。现在分词一般作时间状语和方式状语，因此排除B、C两项，又根据句意可知这一动作不是发生在过去，故不能用不定式的完成时表示动作已经发生，应排除D项。


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