--- Did you have any difficulty catching yesterday’s lecture?
--- No. The professor spoke very clearly to make his speech easy ______ .A.understoodB.understandC.understandingD.to understand
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D解析考查非谓语动词。此处应用不定式的主动形式表示被动意义。句意是：--你听懂昨天的讲座有困难吗？--不，教授讲的很清楚，他的演讲很容易理解。选D。