After the explosion，the roads are full of people leaving the city. A. afraidB. frightened

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A. afraid
(答案→)B. frightened
C. frightening
D. scary
解析：形容词辨析。过去分词转换的形容词常常用来修饰人，现在分词转换的形容词常常用来修饰事物，afraid害怕的；scary令人害怕的；本题中用frightened修饰people。句意：爆炸以后，路上都是要离开这个城市的恐惧的人群。根据惊讶说明B正确。