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

分析 我們不得不每天再多工作兩小時(shí)以使項(xiàng)目按計(jì)劃完成．

解答 答案：to complete
解析：分析句子結(jié)構(gòu)可知，橫線前面的句子已經(jīng)完整；根據(jù)句意可知"每天再多工作"的"目的"是"按計(jì)劃完成項(xiàng)目"，故應(yīng)該使用動(dòng)詞不定式（to do結(jié)構(gòu)）作目的狀語．綜上，本題答案為：to complete．

點(diǎn)評(píng) 本題考查單詞填空，做此類題目時(shí)一定仔細(xì)分析句子結(jié)構(gòu)并結(jié)合句意及所給詞確定所填詞的正確形式．

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