Most people attending his lecture have found that they have learned something(use)

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问题 Most people attending his lecture have found that they have learned something(use)

选项

答案useful

解析 由句子结构可知,空格处的词语应该是作不定代词something的后置定语,因此应该填入形容词形式。use对应的形容词有3个,used“旧的,二手的”不符合句意,故排除;usable“可用的”,主要指something is in good condition that can be used,也不符合句意;useful“有用的”符合句意,所以空格处应该填入useful。
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