An audience’s humorous words made us , so the lecturer couldn’t make himself .A.laugh; hearingB.laugh; heardC.laughing; hearD.laughed; to be heard
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B解析考查固定结构已经分词做补足语的用法。Make sb do sth让某人做某事；make himself heard中的heard是过去分词做宾语补足语。句意：观众幽默的话让我们大笑，那么演讲者无法让自己被听见了。