You should have looked it over carefully yesterday 88._________ you paid for it.可以填IF么

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You should have looked it over carefully yesterday 88._________ you paid for it.可以填IF么
You should have looked it over carefully yesterday 88._________ you paid for it.
可以填IF么

You should have looked it over carefully yesterday 88._________ you paid for it.可以填IF么
when
既成事实 不用if

before
在你买之前,你本该仔细检查
希望对你有帮助~

不能。
这句话用了虚拟语气,表示的是一种对已经发生的事情的一种假定。是已经发生过的事实,应该用when

填before比较符合句意
你昨天应该在付帐只钱把它看仔细了。