---What’s the main purpose of tonight’s meeting?---We are going to talk about the problem ______ at the last meeting.A.having discussedB.to be discussedC.being discussedD.discussed
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D解析考查非谓语动词作后置定语。 the problem 和 discuss是动宾关系，所以要用过去分词形式；且 last meeting表示事情已经过去，选D。表被动和完成。