Preparing all the needed items is important to successful pr

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Preparing all the needed items is important to successful project.请问为何用is.

【Preparing all the needed items】主语【 is important to 】谓语【successful project.】宾语
从句子成分分析知道,Preparing all the needed items 是-ving形式短语,即动名词短语,作主语.按照英语语法,不定式、动名词、从句作主语,表示单一内容或指代单一对象时,谓语动词用单数.因此,后面用了is.
【 Preparing动名词】+【 all the needed items】宾语（或状语）=动名词短语
句意：准备所有这些物品是该项目成功的关键.

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