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

試題分析：考查形容詞：句意：愛麗絲壹動不動，害怕狗會攻擊她。她後來告訴我：“這是我壹生中最令人害怕的經歷”。第壹空修飾人，用frightened;第二空修飾experience用frightening，選B。