问题描述：
be后面加什么词性的词
名词,形容词,副词,动词?为什么they were so frightful错,是形容词.they were so frightened.对,是动词?
名词,形容词,副词,动词?为什么they were so frightful错,是形容词.they were so frightened.对,是动词?
问题解答：
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