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____ economically,one gallon of oil will last at least two months.
A.Using B.Used C.Having used D.To be used
人气:363 ℃ 时间:2020-09-29 13:39:15
解答
B 分词短语做条件状语,后面主语是一加仑油,所以要用过去分词,表被动
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