We can save water __ the taps when we don't use it.A.by not turning offB.by turning offC.by not turn offD.by turn off
问题描述：
We can save water __ the taps when we don't use it.
A.by not turning off
B.by turning off
C.by not turn off
D.by turn off
答
B by doing sth 通过……方法 不用的时候关紧水龙头可以节约水