The thief spoke in a voice and the little boy was very A. frightening; frightenedB. frig

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(答案→)A. frightening; frightened
B. frightened; frightening
C. frightening; frightening
D. frightened; frightened
解析：考查形容词：frightening令人害怕的，frightened感到害怕的，句意是：小偷用令人害怕的声音说话，小男孩很害怕。选A。