we ___each other since we were children.(A know B kenw C have known D had known)

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we ___each other since we were children.(A know B kenw C have known D had known)

we ___each other since we were children.(A know B kenw C have known D had known)
we ___each other since we were children.(A know B kenw C have known D had known)

we ___each other since we were children.(A know B kenw C have known D had known)
D,自从我们是孩子时,我们就已经知道对方了,说话人的动作从过去一直持续到现在,过去认识,现在还认识.