改错:1:I repeated my question several times and at last he understandS求大神帮助

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改错:1:I repeated my question several times and at last he understandS求大神帮助
改错:1:I repeated my question several times and at last he understandS求大神帮助

改错:1:I repeated my question several times and at last he understandS求大神帮助
understands改为understood 前面为过去时,时态保持一致