must be used这种说法很常见
后面跟什么要看你想表达什么,一般来说 for指为了什么,on指用在什么上
如：
The donation must be used for the disabled.捐款必须用于残疾人.
The logo must be used on all printings.图标必须印在所有印刷品上.
有must be used说法吗?
3个回答
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must be是被动语态吗