The local government cut down their costs _____30 percent.

问题描述:

The local government cut down their costs _____30 percent.
A.at B.by C.for D.with 是固定用法吗?

by
对,具体减少,多少 要用by
请及时采纳,不懂继续问( 天天在线 )
(*^__^*) 祝学习进步! 谢谢!