____ economically,one gallon of oil will last at least two months.

分类: 作业答案 • 2022-05-07 12:31:11

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

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