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Once having made a promise,you should keep it.

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Once having made a promise,you should keep it.
have为什么要用having?
Once having made a promise,you should keep it.
having 是非谓语形式,表示主动,逻辑主语是you.you是主动地make promise的
“一旦已经做出承诺,你就应该信守承诺”
再问: 不是有once开头吗?怎么还用having?
再答: once只是个连词,不影响非谓语动词的使用。