( ) economically, one tin of oil will last at least three months.A to useB to be usedC usingD used为什么选D不选B啊?

分类: 作业答案 • 2022-07-27 10:29:31

问题描述：

( ) economically, one tin of oil will last at least three months.
A to use
B to be used
C using
D used
为什么选D不选B啊?

答