( ) economically, one tin of oil will last at least three months.
问题描述:
( ) economically, one tin of oil will last at least three months.
Ato use
B to be used
C using
D used
为什么选D不选B啊?
答
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
如果节约用油 ,一桶油至少可以维持3个月
to be used 不定式作状语表示的是目的 “为了节省用油” 与后半句逻辑上说不通