______ (use) economically, one tin of oil will last at least two months.

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问题 ______ (use) economically, one tin of oil will last at least two months.

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答案Used

解析 分词的用法。此题考查的是过去分词作状语。由于分词与主语是被动关系,所以使用过去分词。[例句] Given more attention,the trees could have grown better.假如多给些照顾,那些树会长得更好。
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