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    (2013·银川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going.

    A．whether B．how

    C．where D．when

     

    A

    【解析】选A　考查主语从句。句意：这个计划是否足够实用，以使这个项目继续下去还有待观察。it是形式主语，真正的主语是whether引导的从句。whether“是否”，符合句意。

     

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