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

分类: 作业答案 • 2022-07-31 13:20:22

问题描述：

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

答

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

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