Alice kept perfectly still, ______ that the dog might attack her. “It was the most ______ exper..

试题分析：考查形容词：句意：爱丽丝一动不动，害怕狗会攻击她。她后来告诉我：“这是我一生中最令人害怕的经历”。第一空修饰人，用frightened;第二空修饰experience用frightening，选B。