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

问题描述:

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

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

D

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