____ economically,one gallon of oil will last at least two months.A.Using B.Used C.Having used D.To be used

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____economically,onegallonofoilwilllastatleasttwomonths.A.UsingB.UsedC.HavingusedD.Tobeused____econo

____ economically,one gallon of oil will last at least two months.A.Using B.Used C.Having used D.To be used
____ economically,one gallon of oil will last at least two months.
A.Using B.Used C.Having used D.To be used

____ economically,one gallon of oil will last at least two months.A.Using B.Used C.Having used D.To be used
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

d 不定式短语的被动形式,表示还没有去做,符合这个句子的假设条件

D