Seeing a stranger with a knife in his hand, the little girl stood under the tree, out of

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(答案→)A. frightened
B. be frightened
C. to be frightened
D. frightening
解析：考查分词用法。本题中的frightened感到害怕的；用形容词短语frightened out of her mind修饰主语the little girl.句意：看到一个陌生人手里拿着刀，那个小女孩站在树下，脑海中非常害怕。故A正确。