The problem ------- you argued about yesterday has been solv

这里关系代词做宾语,可用that或which或不填（省略）,或about which you argued yesterday… D错在：把定语从句还原成简单句you argued about for the problem… argue about是及物动词短语,若用D,导致该及物动词短语缺宾语.且argue about（为…争辩）和argue for(为支持…而争辩)是两个短语,意思不同.例Ministers argued for and against the proposals.部长们为支持或反对这些提案展开了辩论