_____ scores of times ,but he still couldn’t understand it .<br>·A Having explained <br>·B Having beeexplained <br>·C Though it was explained <br>·D It was explained

_____ scores of times ,but he still couldn’t understand it .
·A Having explained
·B Having beeexplained
·C Though it was explained
·D It was explained

出自：延安大学PowerPoint 图文演示技术

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