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    9．We'll have to work two more hours a dayto complete the project as planned．（complete）

    分析 我们不得不每天再多工作两小时以使项目按计划完成．

    解答 答案：to complete
    解析：分析句子结构可知，横线前面的句子已经完整；根据句意可知"每天再多工作"的"目的"是"按计划完成项目"，故应该使用动词不定式（to do结构）作目的状语．综上，本题答案为：to complete．

    点评 本题考查单词填空，做此类题目时一定仔细分析句子结构并结合句意及所给词确定所填词的正确形式．

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