一道英语选择题,不懂啊（）economically,one gallon of oil will last for at least two monthsA.UsingB.To be usedC.UsedD.Having used

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一道英语选择题,不懂啊（）economically,one gallon of oil will last for at least two monthsA.UsingB.To be usedC.UsedD.Having used
一道英语选择题,不懂啊
（）economically,one gallon of oil will last for at least two months
A.Using
B.To be used
C.Used
D.Having used

一道英语选择题,不懂啊（）economically,one gallon of oil will last for at least two monthsA.UsingB.To be usedC.UsedD.Having used
C
油显然是被用所以用被动,排除AD
句子想表达的是一种假设语气,B表示将来,不合题意
Used=If it is used

c
每加仑汽油在合理利用的情况下最少可以用两个月
此处used是一个非谓语动词表示被动

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