—Did you have any difficulty catching yesterday’s lecture?—No. The professor spoke very clearly to make his speech easy _____A.understoodB.understandingC.to be understoodD.to understand
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Ｄ解析这题考查句型:make+宾语+adj+to do句型，这里的不定式是主动表示被动。句意是：教授说的很清楚使他的演讲很容易理解。选D。