.I have rung her but there was no answer.句中Be动词为过去式,为什么have不用过去式?

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• .I have rung her but there was no answer.句中Be动词为过去式,为什么have不用过去式?
• .I have rung her but there was no answer.句中Be动词为过去式,为什么have不用过去式?
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